• WordNet 3.6
    • adj deep exhibiting great cunning usually with secrecy "deep political machinations","a deep plot"
    • adj deep strong; intense "deep purple","a rich red"
    • adj deep very distant in time or space "deep in the past","deep in enemy territory","deep in the woods","a deep space probe"
    • adj deep having great spatial extension or penetration downward or inward from an outer surface or backward or laterally or outward from a center; sometimes used in combination "a deep well","a deep dive","deep water","a deep casserole","a deep gash","deep massage","deep pressure receptors in muscles","deep shelves","a deep closet","surrounded by a deep yard","hit the ball to deep center field","in deep space","waist-deep"
    • adj deep relatively deep or strong; affecting one deeply "a deep breath","a deep sigh","deep concentration","deep emotion","a deep trance","in a deep sleep"
    • adj deep difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge "the professor's lectures were so abstruse that students tended to avoid them","a deep metaphysical theory","some recondite problem in historiography"
    • adj deep of an obscure nature "the new insurance policy is written without cryptic or mysterious terms","a deep dark secret","the inscrutable workings of Providence","in its mysterious past it encompasses all the dim origins of life"- Rachel Carson","rituals totally mystifying to visitors from other lands"
    • adj deep with head or back bent low "a deep bow"
    • adj deep having or denoting a low vocal or instrumental range "a deep voice","a bass voice is lower than a baritone voice","a bass clarinet"
    • adj deep large in quantity or size "deep cuts in the budget"
    • adj deep extreme "in deep trouble","deep happiness"
    • adj deep (of darkness) very intense "thick night","thick darkness","a face in deep shadow","deep night"
    • adj deep marked by depth of thinking "deep thoughts","a deep allegory"
    • adj deep relatively thick from top to bottom "deep carpets","deep snow"
    • adj deep extending relatively far inward "a deep border"
    • adv deep to a great depth; far down "dived deeply","dug deep"
    • adv deep to a great distance "penetrated deep into enemy territory","went deep into the woods"
    • adv deep to an advanced time "deep into the night","talked late into the evening"
    • n deep literary term for an ocean "denizens of the deep"
    • n deep a long steep-sided depression in the ocean floor
    • n deep the central and most intense or profound part "in the deep of night","in the deep of winter"
    • ***

Additional illustrations & photos:

He Did Swim in Deep Waters--1-23-048 He Did Swim in Deep Waters--1-23-048
Guarding the Graveyard of the Deep Guarding the Graveyard of the Deep
Deep Field Deep Field

Webster's Revised Unabridged Dictionary
  • Interesting fact: Jellyfish can sense a storm 10 to 15 hrs. before it actually occurs and leaves the shore and go into the deep sea.
    • Deep 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. "Shadowing squadrons deep .""Safely in harbor
      Is the king's ship in the deep nook."
    • Deep 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. "The water where the brook is deep ."
    • Deep Hard to penetrate or comprehend; profound; -- opposed to shallow or superficial; intricate; mysterious; not obvious; obscure; as, a deep subject or plot. "Speculations high or deep .""A question deep almost as the mystery of life.""O Lord, . . . thy thoughts are very deep ."
    • Deep Low in situation; lying far below the general surface; as, a deep valley.
    • Deep Muddy; boggy; sandy; -- said of roads. "The ways in that vale were very deep ."
    • Deep Of low tone; full-toned; not high or sharp; grave; heavy. "The deep thunder.""The bass of heaven's deep organ."
    • Deep Of penetrating or far-reaching intellect; not superficial; thoroughly skilled; sagacious; cunning. "Deep clerks she dumbs."
    • Deep Profound; thorough; complete; unmixed; intense; heavy; heartfelt; as, deep distress; deep melancholy; deep horror. "Deep despair.""Deep silence.""Deep sleep.""Deeper darkness.""Their deep poverty.""An attitude of deep respect."
    • Deep Strongly colored; dark; intense; not light or thin; as, deep blue or crimson.
    • Deep That which is deep, especially deep water, as the sea or ocean; an abyss; a great depth. "Courage from the deeps of knowledge springs.""The hollow deep of hell resounded.""Blue Neptune storms, the bellowing deeps resound."
    • Deep That which is profound, not easily fathomed, or incomprehensible; a moral or spiritual depth or abyss. "Thy judgments are a great deep .""The deep of night is crept upon our talk."
    • adv Deep To a great depth; with depth; far down; profoundly; deeply.Deep, in its usual adverbial senses, is often prefixed to an adjective; as, deep-chested, deep-cut, deep-seated, deep-toned, deep-voiced, “deep-uddered kine.” "Deep -versed in books, and shallow in himself.""Drink deep , or taste not the Pierian spring."
    • ***
Century Dictionary and Cyclopedia
  • Interesting fact: The deepest hole ever made in the world is in Texas. It is as deep as 20 empire state buildings but only 3 inches wide. (Who made it? A petroleum company)
    • deep Having considerable or great extension downward, or in a direction viewed as analogous with downward. Especially, as measured from the surface or top downward: extending far downward; profound: opposed to shallow: as, deep water; a deep mine; a deep well; a deep valley.
    • deep As measured from the point of view: extending far above; lofty: as, a deep sky.
    • deep As measured from without inward: extending or entering far within; situated far within or toward the center.
    • deep As measured from the front backward: long: as, a deep house; a deep lot.
    • deep Having (a certain) extension as measured from the surface downward or from the front backward: as, a mine 1,000 feet deep; a case 12 inches long and 3 inches deep; a house 40 feet deep; a file of soldiers six deep.
    • deep Immersed; absorbed; engrossed; wholly occupied: as,deep in figures.
    • deep Closely involved or implicated.
    • deep Hard to get to the bottom or foundation of; difficult to penetrate or understand; not easily fathomed; profound; abstruse.
    • deep Sagacious; penetrating; profound: as, a man of deep insight.
    • deep Artful; contriving; plotting; insidious; designing: as, he is a deep schemer.
    • deep Grave in sound; low in pitch: as, the deep tones of an organ.
    • deep Great in degree; intense; extreme; profound: as, deep silence; deep darkness; deep grief; a deep black.
    • deep Muddy; boggy; having much loose sand or soil: applied to roads.
    • deep Heartfelt; earnest; affecting.
    • deep Profound; thorough.
    • deep Late; advanced in time.
    • deep In logic, signifying much; having many predicates. See depth, 9. Synonyms Difficult, knotty, mysterious. Shrewd, crafty, cunning.
    • n deep That which is of great depth. Specifically The sea; the abyss of waters; the ocean; any great body of water.
    • n deep plural A deep channel near a town: as, Memel Deeps, Prussia; Boston Deeps, near Boston, England.
    • n deep A name given by geographers to well-marked depressions in the ocean-bed greater than two thousand fathoms.
    • n deep The sky; the unclouded heavens.
    • n deep In coal-mining, the lowest part of the mine, especially the portion lower than the bottom of the shaft, or the levels extending therefrom.
    • n deep Any abyss.
    • n deep Nautical, the distance in fathoms between two successive marks on a lead-line: used in announcing soundings when the depth is greater than the mark under water and less than the one above it: as, by the deep 4. See lead-line.
    • n deep That which is too profound or vast to be fathomed or comprehended; a profound mystery.
    • n deep Depth; distance downward or outward.
    • n deep The middle point; the point of greatest intensity; the culmination.
    • deep Deeply.
    • deep To become deep; deepen.
    • deep To go deep; sink.
    • ***
Chambers's Twentieth Century Dictionary
  • Interesting fact: The Metro subway of Washington, DC, has several really deep stations. Its Forrest Glen station - in the Maryland suburbs - is 196 feet deep and has the longest subway escalator in the Western Hemisphere. But MOST of the subway stations in Leningrad are deeper than that.
    • adj Deep dēp extending far down or far from the outside: difficult to understand: secret: wise and penetrating: cunning: very still: profound: profoundly learned in a language: intense, heart-felt: sunk low: low or grave: (of a road) encumbered with mud, sand, or ruts
    • adv Deep in a deep manner
    • n Deep that which is deep: the sea: anything profound or incomprehensible
    • v.i Deep to become deeper
    • ***


  • John Milton
    “Deep versed in books and shallow in himself.”
  • Ava Gardner
    Ava Gardner
    “Deep down, I'm pretty superficial.”
  • Johann Wolfgang Von Goethe
    “Where there is much light, the shadow is deep.”
  • Thomas Fuller
    “Search not a wound too deep lest thou make a new one.”
  • Brihadaranyaka Upanishad
    Brihadaranyaka Upanishad
    “You are what your deep driving desire is.”
  • King Jr. Martin Luther
    “There can be no deep disappointment where there is not deep love.”


Beauty is only skin deep - This idiom means that appearances can be deceptive and something that seems or looks good may turn out to be bad.
Between the devil and the deep blue sea - If you are caught between the devil and the deep blue sea, you are in a dilemma; a difficult choice.
Deep pockets - If someone has deep pockets, they are wealthy.
Deep pockets but short arms - Someone who has money but never puts his hand in his pocket to pay for anything has deep pockets but short arms.
Dig way down deep - When someone digs way down deep, they look into their inner feelings to see how they feel about it.
Still waters run deep - People use this idiom to imply that people who are quiet and don't try to attract attention are often more interesting than people who do try to get attention.
Throw someone in at the deep end - If you are thrown in at the deep end, you have to deal with serious issues the moment you start something like a job, instead of having time to acquire experience.


Webster's Revised Unabridged Dictionary
OE. dep, deop, AS. deóp,; akin to D. diep, G. tief, Icel. djūpr, Sw. diup, Dan. dyb, Goth. diups,; fr. the root of E. dip, dive,. See Dip Dive


In literature:

Ater: deep black; not shining.
"Explanation of Terms Used in Entomology" by John. B. Smith
Salt River enters the valley after a tumultuous passage through a deep and rugged canyon forty miles long.
"Wealth of the World's Waste Places and Oceania" by Jewett Castello Gilson
For a moment he held her in silence broken only by a deep sob.
"The Root of Evil" by Thomas Dixon
Swift course we made, for Neptune smooth'd The waves before us of the monstrous Deep.
"The Odyssey of Homer" by Homer
There were pretty deep shadows around him, for the timbered sides of the ravine kept the glow of the campfire shut in from the ice.
"The Camp in the Snow" by William Murray Graydon
The deep sea is the eel's nursery; not deep sea in the ordinary sense, but so deep that no light penetrates.
"Chatterbox, 1906" by Various
None had ever gone so deep.
"The Snowshoe Trail" by Edison Marshall
Perchance the stream is too rapid or too deep to be forded.
"The Western World" by W.H.G. Kingston
The three white men were deep in conversation and now and then they pointed towards the north.
"The Border Watch" by Joseph A. Altsheler
Through the swamp ran a watery sort of drain about four feet deep.
"Q.6.a and Other places" by Francis Buckley

In poetry:

See how the sun-god
The summer lying
Deep in flowers;
"Summer Songs" by Richard Le Gallienne
There I am,
a deep mamma in a litany
Is this joviality then, this grotesque
"News" by Kenneth Koch
In the Kurgan deep,
Met in open fight,
Thou hast e'en subdued
The fierce Tartar's might.
"To Russia" by Ivan Nikitin
SILENT are the green looms
And the weavers sleep
Nestled in the piled glooms,
Deep on deep.
"Break Of Day" by John Gneisenau Neihardt
How deep the space now vacant,
How vast and wide!
Or is it only greater
Since Love has died?
"The Room" by Charles Hanson Towne
Only the true, the strong,
The love, whose trust
Woman's deep soul too long
Pours on the dust!
"Woman On The Field Of Battle" by Felicia Dorothea Hemans

In news:

Deep cuts to Oakland schools' special education programs, made in the last week of school, blindside teachers and families.
Doesn't carve very deep into the wake.
Dogfighting is illegal in all states and a felony in 47, but the activity is on the rise, particularly outside its traditional stronghold in the Deep South.
The Worm digs deep, and it's not just dirt he's shoveling.
Rand Paul often shies away from deep foreign policy discussions.
The Tree of Life in Bahrain is a centuries-old mesquite tree in the middle of the desert with taproots that extend over 160 feet deep.
Collin Revercomb caught this nice, 28-inch bluefish from his family's boat deep sea fishing in his family's boat outside of Chatham, Mass.
These photos are from a fishing trip I took with some business colleagues off of Stellwagen Bank, about 22 miles off the Boston, Massachusetts shore on the private fishing vessel "Deep See".
The day of Aug 6, 2001, broke in the capital with the steamy torpor of deep summer.
Jean Le Boeuf 's Twitter restaurant review: Deep Down South BBQ.
Deep Down South is open 10 a.m.-late Wednesday to Saturday at 2916 Fowler St, Fort Myers.
Black Sabbath & Deep Purple Born Again Again.
The Canadian company had found the largest gold deposit of the century, buried deep underground in a dense Indonesian jungle on the island of Borneo .
All should be well as Decepticon leader Megatron (voiced by Hugo Weaving), is buried deep in the ocean.
The billionaire's threat to bring down the government has fizzled, but his influence remains deep.

In science:

Five heavy-element absorption line systems have been identified, 4 of which overlap the well-explored redshift range covered by deep galaxy redshift surveys towards the HDF.
QSOs and Absorption Line Systems Surrounding the Hubble Deep Field
Deep galaxy redshift samples are permitting a new and often surprising view of the Universe at much younger epochs, and into which the role of gas, both hydrogen and processed, via QSO absorption line systems can be incorporated.
QSOs and Absorption Line Systems Surrounding the Hubble Deep Field
Indeed, this latter approach is the primary justification for the construction of the Hubble Deep Field South, and a survey similar to ours for additional QSOs in that direction of the sky is currently taking place (Teplitz et al. 1998).
QSOs and Absorption Line Systems Surrounding the Hubble Deep Field
Of the four systems that overlap the redshift range explored in deep galaxy redshift surveys of the HDF, two lie at or very near one of the strongest redshift peaks in the galaxy distribution.
QSOs and Absorption Line Systems Surrounding the Hubble Deep Field
Physics of grain alignment is deep and exciting.
Physics of Grain Alignment