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Soviet military strategy in the 1920s and 1930s
Deep operation (Russian: Глубокая операция, glubokaya operatsiya), also known as Soviet deep battle, was a military theory developed by the Soviet Union
Deep_operation
US operations in Antarctica
Operation Deep Freeze is the code name for a series of United States missions to Antarctica, beginning with "Operation Deep Freeze I" in 1955–56, followed
Operation_Deep_Freeze
Russian and Soviet military leader (1893–1937)
was a driving force behind the Soviet development of the theory of deep operations in the 1920s and 1930s. Soviet authorities accused Tukhachevsky of
Mikhail_Tukhachevsky
Chinese artificial intelligence company
Hangzhou DeepSeek Artificial Intelligence Basic Technology Research Co., Ltd., doing business as DeepSeek, is a Chinese artificial intelligence (AI) company
DeepSeek
Military strategy
Defence in depth (also known as deep defence or elastic defence) is a military strategy that seeks to delay rather than prevent the advance of an attacker
Defence_in_depth
1944 Soviet military offensive during WW2
strategies of Soviet deep battle and maskirovka (deception) to their full extent for the first time, albeit with continuing heavy losses. Operation Bagration diverted
Operation_Bagration
Type of concealed or secretive government activity
A covert operation, clandestine operation or undercover operation is a military or police operation involving a covert agent or troops acting under an
Covert_operation
Branch of machine learning
In machine learning, deep learning (DL) focuses on utilizing multilayered neural networks to perform tasks such as classification, regression, and representation
Deep_learning
Between strategic and tactical warfare
third level of military thinking, which was introduced as part of the deep operation military theory that Soviet armed forces developed during the 1920s
Operational_level_of_war
Soviet army and air force from 1918 to 1946
the deep operation doctrine, a direct consequence of their experiences in the Polish–Soviet War and in the Russian Civil War. To achieve victory, deep operations
Red_Army
Coordinated military actions of a state or non-state actor
A military operation (op) is the coordinated military actions of a state, or a non-state actor, in response to a developing situation. These actions are
Military_operation
Soviet military commander and theoretician (1894–1931)
these two works, he elaborated his deep operation theory about the future warfare. The objective of a "deep operation" was to attack the enemy simultaneously
Vladimir_Triandafillov
1957 NATO naval exercise
Operation Deep Water was a 1957 NATO naval exercise held in the Mediterranean Sea that simulated protecting the Dardanelles from a Soviet invasion. By
Operation_Deep_Water
British Commandos during the Second World War
Operation Deep Cut was a raid by British Commandos during the Second World War. It was carried out by No. 1 Section of 5 Troop No. 1 Commando at Saint-Vaast-la-Hougue
Operation_Deep_Cut
Units with transport and combat vehicles
exploitation phase of offensives, as part of the prewar Soviet concept of deep operations. The Soviet Army also created several cavalry mechanized groups in
Mechanized_infantry
Soviet Military Theorist (c. 1890–1939)
Triandafillov made significant contributions to the use of technology in deep offensive operations. Varfolomeev was one of the foremost military theorists teaching
Nikolai_Varfolomeev
Reconnaissance asset of the USMC
their assigned areas of operations—whereas Division Recon conducts close and distant operations, Force Recon conducts deep operations—these two separate reconnaissance
United States Marine Corps Reconnaissance Selection and Indoctrination
United_States_Marine_Corps_Reconnaissance_Selection_and_Indoctrination
American film series
Operation Delta Force at IMDb Operation Delta Force 2: Mayday at IMDb Operation Delta Force 3: Clear Target at IMDb Operation Delta Force 4: Deep Fault
Operation_Delta_Force
Part of the Vietnam War (1971)
Operation Proud Deep Alpha was a limited aerial bombardment campaign conducted by the United States (U.S.) Seventh Air Force and U.S. Navy against North
Operation_Proud_Deep_Alpha
Information operations to assist military objectives
modern psychological operations (PSYOPs), has been known by many other names or terms, including Military Information Support Operations (MISO), political
Psychological_warfare
List of actions an armed force intends to carry out to achieve combat goals
A military operation plan (commonly called a war plan before World War II) is a formal plan for military armed forces, their military organizations and
Military_operation_plan
Area or place where important military events occur or are progressing
and sea area that is—or that may potentially become—involved in war operations. In his book On War, Carl von Clausewitz defines Kriegstheater as a "portion
Theater_(warfare)
Soviet tank corps
mechanized group which performed the deep operations on the Eastern Front during the Second World War. The deep operations theory developed in cooperation
Operational_manoeuvre_group
Military units deployed via parachute
their concept of "deep battle", throughout the war. The largest drop during the war was corps-sized (the Vyazma airborne Operation, the 4th Airborne Corps)
Airborne_forces
1987 video game
Deep Space: Operation Copernicus is a video game published in 1988 by Sir-Tech. Deep Space: Operation Copernicus is a game in which the player must use
Deep Space: Operation Copernicus
Deep_Space:_Operation_Copernicus
United States defense category
Information Operations is a category of direct and indirect support operations for the United States Military. By definition in Joint Publication 3-13
Information Operations (United States)
Information_Operations_(United_States)
Seized darknet marketplace
Archetyp was seized by the BKA in June 2025 in an operation called Operation Deep Sentinel. The operation was a collaborative effort by the European Union
Archetyp_Market
Warfare by small groups against regular forces
become agents of influence. For successful operations, surprise must be achieved by the guerrillas. If the operation has been betrayed or compromised, it is
Guerrilla_warfare
Coordinated missions, operations and projects
This is a list of missions, operations, and projects. Missions in support of other missions are not listed independently. See also List of military engagements
List_of_military_operations
Company providing armed combat or security services
military personnel to other countries for various privatised foreign policy operations. Contracts were mainly with the Gulf States and involved weapons supply
Private_military_company
military operations and missions commonly associated with World War II. As of 2022[update] this is not a comprehensive list, but most major operations that
List of World War II military operations
List_of_World_War_II_military_operations
1941 World War II military offensive
Operation Brevity was an attack in mid-May 1941, during the Western Desert Campaign of the Second World War. Conceived by the commander-in-chief of the
Operation_Brevity
British action comedy film
Deep Cover is a 2025 British action comedy film directed by Tom Kingsley and written by Derek Connolly, Colin Trevorrow, Ben Ashenden and Alexander Owen
Deep_Cover_(2025_film)
Military strategy pioneered by Nazi Germany
counter-offensives and the revival of deep operations. In the summer of 1944, the Red Army destroyed Army Group Centre in Operation Bagration by using combined-arms
Blitzkrieg
Naval force capable of operating in littoral waters
riverine navy, in the broadest sense, is a naval force capable of military operations in inland waters (rivers, lakes and inland seas) and nearshores. Brown-water
Brown-water_navy
Swiss oceanographer and engineer (1922–2008)
Bertrand Piccard's website Official press release regarding Challenger Deep operation. The Ben Franklin - Grumman/Piccard PX-15. From Sea to Shining Sea:
Jacques_Piccard
points Airborne operations Air mobile operations Amphibious operations Motorized operations Tank desant Mechanized operations Armored operations Raiding – a
List_of_military_tactics
Marshal of the Soviet Union
strong opponent to Marshal Mikhail Tukhachevsky's reforms and his deep operations theory, and dismissed innovations such as the T-34 and KV-1 tanks and
Grigory_Kulik
Branch of underwater warfare
Previously the emphasis had been largely on deep water operation but this has now switched to littoral operation where ASW is generally more difficult. There
Anti-submarine_warfare
Temporary line created when a military unit reaches a landing beach by sea
War. Although many references state that Operation Neptune refers to the naval operations in support of Operation Overlord, the most reliable references
Beachhead
1996 and 1997 chess matches
media, and Deep Blue became a celebrity. After the match, it was reported that IBM had dismantled Deep Blue, but in fact it remained in operation for several
Deep Blue versus Garry Kasparov
Deep_Blue_versus_Garry_Kasparov
German armored military unit of WWII
military flags. British armoured formations of the Second World War Deep operation Maneuver warfare Mechanised corps (Soviet Union) SS Panzer Division
Panzer_division_(Wehrmacht)
Concept in military and political science
In Deep: The FBI, the CIA, and the Truth about America's "Deep State". W. W. Norton & Company. p. iv. ISBN 9781324003557. To conservatives, the "deep state"
Military–industrial_complex
Approach to warfare
temporarily attaching a tank company to an infantry battalion. Combined arms operations date back to antiquity, where armies would usually field a screen of skirmishers
Combined_arms
WWII battle
defenders, but would lead to much larger casualties than would a successful deep operation breakthrough. This second option was backed by Stalin due to the concern
Battle_of_the_Dnieper
Deployment of a state's military to fight abroad
raiding tactics were expanded into the more complex expeditionary warfare operations by Alexander the Great who used naval vessels for both troop transporting
Expeditionary_warfare
British Second World War deception operation
Operation Mincemeat was a successful British deception operation of the Second World War to disguise the 1943 Allied invasion of Sicily. Two members of
Operation_Mincemeat
Technique in object-oriented programming
and deep copy. Many languages allow generic copying by one or either strategy, defining either one copy operation or separate shallow copy and deep copy
Object_copying
Deepest known point of Earth's seabed
sounding in deep water, as the resulting footprint of an acoustic pulse gets large once it reaches a distant sea floor. Further, sonar operation is affected
Challenger_Deep
A military operations area (MOA) is an airspace established outside Class A airspace to separate or segregate certain nonhazardous military activities
Military_operations_area
American science fiction television series
Star Trek: Deep Space Nine (DS9) is an American science-fiction television series created by Rick Berman and Michael Piller. The fourth series in the Star
Star_Trek:_Deep_Space_Nine
Military operation attacking from air and sea to land
Amphibious warfare is a type of offensive military operation that today uses naval ships to project ground and air power onto a hostile or potentially
Amphibious_warfare
Lowest layer in the ocean
The deep sea is broadly defined as the ocean depth where light begins to fade, at an approximate depth of 200 m (660 ft) or the point of transition from
Deep_sea
Topics referred to by the same term
Atlantic Deep Water Operation Deep Water, 1957 NATO naval exercise All pages with titles beginning with Deep Water Deepwater (disambiguation) Deep Waters
Deep_Water
Network of radio communication facilities run by NASA
Complexes communicate directly with the Deep Space Operations Center (also known as Deep Space Network operations control center) located at the JPL facilities
NASA_Deep_Space_Network
Topics referred to by the same term
expanding universe Deep Freeze Range, a mountain range in Antarctica Deep freezer, a stand-alone freezer unit for preserving food Operation Deep Freeze, a series
Deep_Freeze
Transistor current
law Multi-channel length Subthreshold slope Tsividis, Yannis (1999). Operation and Modeling of the MOS Transistor (2 ed.). New York: McGraw-Hill. p. 99
Subthreshold_conduction
Opposite of conventional warfare
Unconventional warfare (UW) is broadly defined as "military and quasi-military operations other than conventional warfare" and may use covert forces or actions
Unconventional_warfare
1941 Axis invasion of the Soviet Union during WWII
Operation Barbarossa was the invasion of the Soviet Union by Nazi Germany and several of its European Axis allies starting on Sunday, 22 June 1941, during
Operation_Barbarossa
Naval force capable of operating across the deep waters of the open oceans
the blue-water navy as "a maritime force capable of sustained operation across the deep waters of open oceans. A blue-water navy allows a country to project
Blue-water_navy
Anti-immigrants vigilante organisation in South Africa
for economic hardship caused by South Africa's deep inequality. Some opposition groups against Operation Dudula have been formed. Kopanang Africa against
Operation_Dudula
Warfare in urban areas
presence of civilians and the complexity of the urban terrain. Urban combat operations may be conducted to capitalize on strategic or tactical advantages associated
Urban_warfare
Management personnel of a military unit
rapidly changing complex operations. They are organised into functional groups such as administration, logistics, operations, intelligence, training,
Staff_(military)
Factor that gives military assets the ability to accomplish greater feats than without it
Boyd contended applies to business, sports, law enforcement and military operations. Boyd's doctrine is widely taught in the American military, and one of
Force_multiplication
Where both sides commit to fight at a location
effect. A pitched battle can decide the outcome of a war or military operation. Pitched battles continued to evolve throughout history as armies implemented
Pitched_battle
Covert government networks
War era, when covert operations were conducted to prevent political instability and counter Soviet influence. The idea of a "deep state" is not exclusive
Deep_state
1945 battle of World War II
Operation Cowboy was fought in the town of Hostau, Sudetenland (now Hostouň in the Czech Republic), on 28 April 1945, in the last days of fighting in
Operation_Cowboy
changed to reflect the year of the operation. Operation Deep Freeze I, Operation Deep Freeze II, and Operation Deep Freeze III laid the groundwork for
American exploration of Antarctica
American_exploration_of_Antarctica
World War II operation in France
Operation Overlord was the codename for the Battle of Normandy, the Allied operation that launched the successful liberation of German-occupied Western
Operation_Overlord
Warfare conducted underground
Institute report notes that Hamas utilizes two distinct types of tunnels: deep, sophisticated ones for senior leaders and shallower variants for lower-level
Subterranean_warfare
2025 Ukrainian military operation in Russia
Operation Spiderweb (Ukrainian: Операція «Павутина», romanized: Operátsija "Pavutýna") was a covert drone attack carried out by the Security Service of
Operation_Spiderweb
Geographic region assigned to a military unit
non-linear operations within a noncontiguous battlespace and within an operational framework with noncontiguous deep, close, and rear areas. Operation Restore
Area_of_responsibility
Member of a resistance movement
troops and significantly hampered their operations in the region. As a result, Soviet authority was re-established deep inside the German-held territories
Partisan_(military)
Military strategy focused on movement
fully. There are similarities between blitzkrieg and the Soviet concept of "deep battle," which the Soviets used to great effect in 1944 and continued to
Maneuver_warfare
Overview of and topical guide to war
Blitzkrieg Soviet deep battle Maneuver warfare Operational manoeuvre group List of military operations Military operation plan Military operations other than
Outline_of_war
Star Trek: Deep Space Nine is the third live-action television series in the Star Trek franchise and aired in syndication from January 1993 through June
List of Star Trek: Deep Space Nine episodes
List_of_Star_Trek:_Deep_Space_Nine_episodes
Military movement of ground forces by air into combat or unsecured areas
and large amounts of supplies in a timely fashion.[citation needed] Operation Deep Water was a 1957 NATO naval exercise held in the Mediterranean Sea that
Air_assault
Type of mobile infantry
Operation Command No. (4) Military Operation Command No. (5) Military Operation Command No. (6) Military Operation Command No. (7) Military Operation
Light_infantry
Clandestine preparations started by governments for anticipated invasions
A stay-behind operation is one where a country places secret operatives or organizations in its own territory, for use in case of a later enemy occupation
Stay-behind
Type of military operation
An offensive is a military operation that seeks through an aggressive projection of armed forces to occupy or recapture territory, gain an objective or
Offensive_(military)
Military transportation of materials and personnel using aircraft
Ethiopia living in refugee camps in Sudan through Operation Moses, Operation Joshua, and Operation Solomon during the Ethiopian famine and civil war.
Airlift
AI research laboratory
Google DeepMind, trading as Google DeepMind or simply DeepMind, is a British-American artificial intelligence (AI) research laboratory which serves as
Google_DeepMind
1944 World War II military operation
Operation Market Garden was an Allied military operation during the Second World War fought in the German-occupied Netherlands from 17 to 25 September
Operation_Market_Garden
United States Marine Corps Reconnaissance Battalion
companies perform both deep reconnaissance and direct action operations. Some of these missions are shared by Marine Special Operations Teams, a subordinate
United States Marine Air-Ground Task Force Reconnaissance
United_States_Marine_Air-Ground_Task_Force_Reconnaissance
Surgical technique using deep hypothermia
Deep hypothermic circulatory arrest (DHCA) is a surgical technique in which the temperature of the body falls significantly (between 20 °C (68 °F) to 25 °C
Deep hypothermic circulatory arrest
Deep_hypothermic_circulatory_arrest
Type of military tactics and operational warfare
John (1987). Deep Battle: The Brainchild of Marshal Tukhachevskii. London: Brassey's Defence Publishers. Smith, Kevin (2012). "Operation Opossum: The
Raid_(military)
Effect of total control in a battlespace
the conduct of joint operations without effective opposition or prohibitive interference. The doctrine of Full Spectrum Operations replaced the prior one
Full-spectrum_dominance
Defunct deepfake pornography website
closure in May 2025 following an investigative journalism operation by multiple publications. MrDeepFakes was established in 2018 following the forced closure
MrDeepFakes
Military engagement
is longer than a week, it is often for reasons of planning called an operation. Battles can be planned, encountered or forced by one side when the other
Battle
Military supply and maintenance
forces. In its most comprehensive sense, it is those aspects or military operations that deal with: Design, development, acquisition, storage, distribution
Military_logistics
Borehole in Russia, deepest on Earth
than 6,810 metres (22,340 ft) deep, preceded Kola SG-3, which was originally intended to reach 7,000 metres (23,000 ft) deep. Drilling at Kola SG-3 began
Kola_Superdeep_Borehole
Military attack by artillery fire
to the 1916 Battle of the Somme or the massed bombardments preceding Operation Uranus during World War II. In modern international humanitarian law,
Bombardment
United States Navy Air Test and Evaluation Squadron
Squadron Six (VX-6), the squadron's mission was to conduct operations in support of Operation Deep Freeze, the operational component of the United States
VXE-6
2024 Israeli airstrikes and raid in Syria
On 8 September 2024, in an operation called Operation Many Ways (Hebrew: מבצע רבות הדרכים), Israeli special forces raided an underground missile production
2024_Masyaf_raid
US Army strategy concept (1982 – late 1990s)
"Active Defense" doctrine, and was itself replaced by "Full Spectrum Operations" in 2001. The basic concept of the Blitzkrieg and similar doctrines was
AirLand_Battle
Veins deep in the body; contrasted with superficial veins
is called deep vein thrombosis. Because of their location deep within the body, operation on these veins can be difficult. Internal jugular vein Brachial
Deep_vein
Alias of Mark Felt, Watergate scandal whistleblower
Deep Throat is the pseudonym given to the secret informant who provided key details about the involvement of U.S. president Richard Nixon's administration
Deep_Throat_(Watergate)
Forced entry by a polity into another polity's territory
or resupply. During Operation Starvation, Allied forces used airdropped mines to severely disrupt Japanese logistical operations within their own borders
Invasion
Combat search and rescue operation during the 2026 Iran War
In early April 2026, a combat search and rescue (CSAR) operation was conducted by the United States Armed Forces to recover two crew members of an F-15E
2026 United States F-15E rescue operation in Iran
2026_United_States_F-15E_rescue_operation_in_Iran
World War II Red Army military operation
support for such an operation was very weak on the Soviet side, especially compared to the requirements of the doctrine of Deep operations, and the practice
Toropets–Kholm_offensive
DEEP OPERATION
DEEP OPERATION
Girl/Female
Assamese, Bengali, Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Sindhi, Telugu, Traditional
Deep
Female
English
English unisex short form of longer names beginning with the letter "D." In some cases, it may be of Scottish origin, associated with the River Dee, possibly DEE means "dark water." Short form of English Deena, meaning "dean, head, leader."
Boy/Male
Sikh
Lamp, Light of the holy word (1)
Boy/Male
Assamese, Bengali, Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Oriya, Punjabi, Sanskrit, Sikh, Sindhi, Tamil, Telugu, Traditional
Superior to Infinity; A Lamp
Surname or Lastname
Indian (northern states)
Indian (northern states) : Hindu name meaning ‘lamp’, from Sanskrit dīpa. It occurs commonly as the final element of compound personal names, e.g. in Kuldeep ‘light of the family’. Subsequently, it appears to have evolved into a surname.English : presumably from the adjective deep, either a topographic name for someone who lived in a deep valley, or perhaps a nickname for a ‘deep’, thoughtful person.
Boy/Male
Indian, Modern
Powerful Man
Surname or Lastname
English
English : variant spelling of Dear.Scottish : habitational name from (Old and New) Deer in Aberdeenshire.Hungarian : variant of Dér, from the secular personal name.
Surname or Lastname
English
English : occupational name for a jailer or someone employed at a keep or castle, Middle English kepe.Americanized spelling of German Kiep, from a short form of the old personal name Gebolf, from a Germanic personal name composed of the elements geb ‘gift’ + wolf ‘wolf’. Compare Gebhardt.
Boy/Male
Hindu, Indian
Deep
Boy/Male
Hindu
A name of Sai baba
Girl/Female
Indian, Traditional
God Writes
Boy/Male
Hindu
A lamp, Beautiful
Boy/Male
Hindu
Divine, Divine luster, Heavenly
Girl/Female
Indian, Sikh
Lotus in the Lamp of Light
Boy/Male
Indian
Lamp, Light of the holy word
Girl/Female
Tamil
Indrina | இநà¯à®¤à¯à®°à®¿à®¨à®¾
Deep
Indrina | இநà¯à®¤à¯à®°à®¿à®¨à®¾
Male
English
English unisex short form of longer names beginning with the letter "D." In some cases, it may be of Scottish origin, associated with the River Dee, possibly DEE means "dark water." Compare with strictly feminine Dee.
Boy/Male
Indian
Lover
Girl/Female
Indian, Punjabi, Sikh
The Lamp of Light
Surname or Lastname
English and Irish
English and Irish : variant of Dean.Dutch : ethnic name for a Dane, Middle Dutch Deen.
DEEP OPERATION
DEEP OPERATION
Boy/Male
Arabic, Bengali, Gujarati, Hindu, Indian, Jain, Kannada, Malayalam, Marathi, Modern, Muslim, Sanskrit, Sindhi, Tamil, Telugu
Mind; Thought; Repetition; Depth Thinking
Boy/Male
Indian
Wakeful, Magician
Girl/Female
Hindu
Seven stars representing seven great saints
Girl/Female
Australian, German, Greek
The Fiery Sun; Mythological Daughter of Agamemnon; Bright; Shining
Surname or Lastname
English
English : variant of Godley.Probably also an Americanized spelling of South German and Swiss German Gütle (or the variants Güttly and Gütler), a status name for a smallholder (see Goodlin).
Boy/Male
Indian, Telugu
Well Knowledge in All Areas
Girl/Female
English Irish
From the round hill; seething pool; or ravine.
Boy/Male
Celtic
From the thorn bush or thicket.
Boy/Male
Arabic, Indian, Muslim
Name Derived from Self Sacrifice
Girl/Female
Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Telugu
Charming Woman
DEEP OPERATION
DEEP OPERATION
DEEP OPERATION
DEEP OPERATION
DEEP OPERATION
a.
Laid deeply; formed with cunning and sagacity; as, deep-laid plans.
a.
Rising to the knees; knee-high; as, water or snow knee-deep.
superl.
Profound; thorough; complete; unmixed; intense; heavy; heartfelt; as, deep distress; deep melancholy; deep horror.
superl.
Low in situation; lying far below the general surface; as, a deep valley.
superl.
Strongly colored; dark; intense; not light or thin; as, deep blue or crimson.
a.
Deep as from the breast to the feet; as high as the breast.
v. t.
To supply with necessaries of life; to entertain; as, to keep boarders.
v. i.
To remain in any position or state; to continue; to abide; to stay; as, to keep at a distance; to keep aloft; to keep near; to keep in the house; to keep before or behind; to keep in favor; to keep out of company, or out reach.
superl.
Extending far back from the front or outer part; of great horizontal dimension (measured backward from the front or nearer part, mouth, etc.); as, a deep cave or recess or wound; a gallery ten seats deep; a company of soldiers six files deep.
n.
The act of a villain; a deed of deep depravity; a crime.
v. t.
To observe duty, as a festival, etc. ; to celebrate; to solemnize; as, to keep a feast.
n.
That which is deep, especially deep water, as the sea or ocean; an abyss; a great depth.
superl.
Extending far below the surface; of great perpendicular dimension (measured from the surface downward, and distinguished from high, which is measured upward); far to the bottom; having a certain depth; as, a deep sea.
n.
The state of being kept; hence, the resulting condition; case; as, to be in good keep.
a.
Sunk to the knees; as, men knee-deep in water.
a.
Of or pertaining to the deeper parts of the sea; as, a deep-sea line (i. e., a line to take soundings at a great depth); deep-sea lead; deep-sea soundings, explorations, etc.
v. t.
To continue in, as a course or mode of action; not to intermit or fall from; to hold to; to maintain; as, to keep silence; to keep one's word; to keep possession.
a.
Having a deep waist, as when, in a ship, the poop and forecastle are much elevated above the deck.
superl.
Hard to penetrate or comprehend; profound; -- opposed to shallow or superficial; intricate; mysterious; not obvious; obscure; as, a deep subject or plot.