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View synonyms for deep

deep

[ deep ]

adjective

deeper, deepest.
  1. extending far down from the top or surface:

    a deep well;

    a deep valley.

    Antonyms: shallow

  2. extending far in or back from the front or from an edge, surface, opening, etc., considered as the front:

    a deep shelf.

  3. extending far in width; broad:

    deep lace;

    a deep border.

  4. ranging far from the earth and sun:

    a deep space probe.

  5. having a specified dimension in depth:

    a tank 8 feet deep.

  6. covered or immersed to a specified depth (often used in combination):

    standing knee-deep in water.

  7. having a specified width or number of items from front to back (often used in combination):

    shelves that are 10 inches deep;

    cars lined up at the entrance gates three-deep.

  8. extending or cutting far down relative to the surface of a given object:

    The knife made a deep scar in the table.

  9. situated far down, in, or back:

    deep below the surface;

    deep in the woods.

  10. reaching or advancing far down:

    a deep dive.

    Antonyms: shallow

  11. coming from far down:

    a deep breath.

  12. made with the body bent or lowered to a considerable degree:

    a deep bow.

  13. immersed or submerged in or heavily covered with (followed by in ):

    a road deep in mud.

  14. difficult to penetrate or understand; abstruse:

    a deep allegory.

    Synonyms: obscure, mysterious, recondite

  15. not superficial; profound:

    deep thoughts.

  16. grave or serious:

    deep disgrace.

  17. deep affections.

  18. deep study.

  19. great in measure; intense; extreme:

    deep sorrow.

  20. sound and heavy:

    deep sleep.

  21. (of colors) dark and vivid:

    a deep red.

  22. low in pitch, as sound, a voice, or the like:

    deep, sonorous tones.

  23. having penetrating intellectual powers:

    a deep scholar.

    Synonyms: sagacious, shrewd, intelligent, wise

  24. profoundly cunning or artful:

    a deep and crafty scheme.

  25. deep, dark secrets.

  26. immersed or involved; enveloped:

    a man deep in debt.

  27. deep in thought.

  28. Baseball. relatively far from home plate:

    He hit the ball into deep center field.

  29. Linguistics. belonging to an early stage in the transformational derivation of a sentence; belonging to the deep structure.


noun

  1. the deep part of a body of water, especially an area of the ocean floor having a depth greater than 18,000 feet (5,400 meters).
  2. a vast extent, as of space or time.
  3. the part of greatest intensity, as of winter.
  4. Nautical. any of the unmarked levels, one fathom apart, on a deep-sea lead line. Compare mark 1( def 20 ).
  5. the deep, Chiefly Literary. the sea or ocean:

    He was laid to rest in the deep.

adverb

deeper, deepest.
  1. to or at a considerable or specified depth:

    The boat rode deep in the water.

  2. far on in time:

    He claimed he could see deep into the future.

  3. Baseball. at or to a deep place or position:

    The outfielders played deep, knowing the batter's reputation as a slugger.

deep

/ diːp /

adjective

  1. extending or situated relatively far down from a surface

    a deep pool

  2. extending or situated relatively far inwards, backwards, or sideways

    a deep border of trees

  3. cricket relatively far from the pitch

    the deep field

    deep third man

    1. postpositive of a specified dimension downwards, inwards, or backwards

      six feet deep

    2. ( in combination )

      a six-foot-deep trench

  4. coming from or penetrating to a great depth

    a deep breath

  5. difficult to understand or penetrate; abstruse
  6. learned or intellectually demanding

    a deep discussion

  7. of great intensity; extreme

    deep happiness

    deep trouble

  8. postpositivefoll byin absorbed or enveloped (by); engrossed or immersed (in)

    deep in debt

    deep in study

  9. very cunning or crafty; devious

    a deep plot

  10. mysterious or obscure

    a deep secret

  11. (of a colour) having an intense or dark hue
  12. low in pitch or tone

    a deep voice

  13. go off the deep end informal.
    1. to lose one's temper; react angrily
    2. to act rashly
  14. in deep water
    in a tricky position or in trouble
  15. throw someone in at the deep end
    See end 1
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

noun

  1. any deep place on land or under water, esp below 6000 metres (3000 fathoms)
  2. the deep
    1. a poetic term for the ocean
    2. cricket the area of the field relatively far from the pitch
  3. the most profound, intense, or central part

    the deep of winter

  4. a vast extent, as of space or time
  5. nautical one of the intervals on a sounding lead, one fathom apart
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

adverb

  1. far on in time; late

    they worked deep into the night

  2. profoundly or intensely
  3. deep down informal.
    in reality, esp as opposed to appearance

    she is a very kind person deep down

  4. deep in the past
    long ago
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Derived Forms

  • ˈdeeply, adverb
  • ˈdeepness, noun
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Other Words From

  • deep·ness noun
  • non·deep adjective
  • o·ver·deep adjective
  • un·deep adjective
  • un·deep·ly adverb
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Word History and Origins

Origin of deep1

First recorded before 900; Middle English dep, Old English dēop; akin to Gothic diups, Old Norse djupr, Dutch diep, Old High German tiof; akin to dip 1( def ), dive ( def )
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Word History and Origins

Origin of deep1

Old English dēop; related to Old High German tiof deep, Old Norse djupr
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Idioms and Phrases

Idioms
  1. go off the deep end,
    1. to enter upon a course of action with heedless or irresponsible indifference to consequences.
    2. to become emotionally overwrought.
  2. in deep water,
    1. in difficult or serious circumstances; in trouble.
    2. in a situation beyond the range of one's capability or skill:

      You're a good student, but you'll be in deep water in medical school.

  3. in deep,
    1. inextricably involved.
    2. having made or committed oneself to make a large financial investment.

More idioms and phrases containing deep

  • beauty is only skin deep
  • between a rock and a hard place (devil and deep blue sea)
  • go off the deep end
  • in deep
  • still waters run deep
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Example Sentences

They also point out that relocation severs the deep, centuries-old connection that rural Tibetans share with their land.

From BBC

We take a deep breath as the chintzy, 90-minute holiday sewage piles onto us, ready to watch it all and come out victorious on the other side.

From Salon

But a later unrelated MRI confirmed it was deep endometriosis over her bowel.

From BBC

Space colonisers come face-to-face with a terrifying life form while scavenging the deep ends of a derelict space station.

From BBC

But even if Trump’s policies help Democrats politically, they may have a deep impact on Californians.

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Related Words

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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