1

deep

adjective \ ˈdēp \
Updated on: 11 Dec 2017

Definition of deep

1 : extending far from some surface or area: such as
a : extending far downward
  • a deep well
  • a deep chasm
b (1) : extending well inward from an outer surface
  • a deep gash
  • a deep-chested animal
(2) : not located superficially within the body
  • deep pressure receptors in muscles
c : extending well back from a surface accepted as front
  • a deep closet
d : extending far laterally from the center
  • deep borders of lace
e sports : occurring or located near the outer limits of the playing area
  • hit to deep right field
f sports : thrown or hit for a considerable distance : thrown or hit deep (see 2deep 3b)
  • a deep pass
  • a deep fly ball
2 : having a specified extension in an implied direction usually downward or backward
  • a shelf 20 inches deep
  • cars parked three-deep
3 a : difficult to penetrate or comprehend : recondite
  • deep mathematical problems
  • deep discussions on the meaning of life
b : mysterious, obscure
  • a deep dark secret
c : grave or lamentable in nature or effect
  • in deepest disgrace
d : of penetrating intellect : wise
  • a deep thinker
e : intensely engrossed or immersed
  • she was deep in her book
f : characterized by profundity of feeling or quality
  • a deep sleep
; also : deep-seated
  • deep religious beliefs
4 a of color : high in saturation and low in lightness
  • a deep red
b : having a low musical pitch (see 4pitch 4b) or pitch range
  • a deep voice
5 a : situated well within the boundaries
  • a house deep in the woods
b : remote in time or space
  • found deep in rural England
c : being below the level of consciousness
  • deep neuroses
d : covered, enclosed, or filled to a specified degree usually used in combination
  • ankle-deep in mud
6 : large
  • deep discounts
7 : having many good players
  • a deep bull pen

deeply

adverb

deepness

noun
in deep water
: in difficulty or distress

Examples of deep in a Sentence

  1. We walked in the deep snow.

  2. a deep valley between the mountains

  3. The water is deepest in the middle of the lake.

  4. She's afraid of swimming in deep water.

  5. a plant with deep roots

  6. The house has lots of deep closets.

  7. She has a small but deep wound on her arm.

  8. This enormous canyon is over a mile deep.

  9. The shelves are 10 inches deep.

  10. He stepped into an ankle-deep puddle of mud.

Recent Examples of deep from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'deep.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of deep

Middle English dep, from Old English dēop; akin to Old High German tiof deep, Old English dyppan to dip — more at dip

Synonym Discussion of deep

broad, wide, deep mean having horizontal extent. broad and wide apply to a surface measured or viewed from side to side.
    • a broad avenue
wide is more common when units of measurement are mentioned
    • rugs eight feet wide
or applied to unfilled space between limits.
    • a wide doorway
broad is preferred when full horizontal extent is considered.
    • broad shoulders
deep may indicate horizontal extent away from the observer or from a front or peripheral point.
    • a deep cupboard
    • deep woods

2

deep

adverb

Definition of deep

1 : to a great depth : deeply
  • still waters run deep
  • tunneled deep into the earth
2 : far on : late
  • danced deep into the night
3 sports
a : near the outer limits of the playing area
  • the shortstop was playing deep
b : long 6
  • threw deep to the wide receiver
  • hit the ball deep to right field

Examples of deep in a Sentence

  1. The ship now lies deep below the water's surface.

  2. Our feet sank deeper into the mud.

  3. The treasure was buried deep within the ground.

  4. Their secret offices were located deep underground.

  5. We walked deep into the forest.

  6. The soldiers are operating deep within enemy territory.

  7. I stood three feet deep in the water.

  8. He stepped ankle-deep into a puddle of mud.

Recent Examples of deep from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'deep.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of deep

see 1deep


3

deep

noun

Definition of deep

1 a : a vast or immeasurable extent : abyss
b (1) : the extent of surrounding space or time
  • the azure deep
(2) nautical : ocean
  • the briny deep
2 : any of the deep portions of a body of water; specifically : a generally long and narrow area in the ocean where the depth exceeds 3000 fathoms (5500 meters)
  • the Aldrich Deep in the south Pacific
3 : the middle or most intense part
  • in the deep of winter
4 nautical : any of the fathom points on a sounding line other than the marks (see 1mark 2b)

Examples of deep in a Sentence

  1. the kind of cold weather that we usually have only in the deep of winter

  2. sailors exploring the farther reaches of the briny deep

Recent Examples of deep from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'deep.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of deep

see 1deep

deep Synonyms

Synonyms
thick, depth, height, middle, midst
Related Words
center, heart

DEEP Defined for English Language Learners

deep

adjective

Definition of deep for English Language Learners

  • : having a large distance to the bottom from the surface or highest point

  • : going far inward from the outside or the front edge of something

  • : located far inside something


deep

adverb

Definition of deep for English Language Learners

  • : far into or below the surface of something

  • : far into or inside something

  • : at a specified measurement downward, inward, or backward


DEEP Defined for Kids

1

deep

adjective \ ˈdēp \

Definition of deep for Students

deeper; deepest
1 : reaching far down below the surface
2 : reaching far inward or back from the front or outer part
  • a deep cut
  • a deep closet
3 : located well below the surface or well within the boundaries of
  • deep in the ground
4 : coming from well within
  • a deep sigh
5 : completely absorbed
  • deep in thought
6 : hard to understand
  • This story is too deep for me.
7 : mysterious
  • a deep, dark secret
8 : extreme in degree : heavy
  • a deep sleep
9 : dark and rich in color
  • a deep red
10 : low in tone
  • a deep voice

deeply

adverb

2

deep

adverb

Definition of deep for Students

deeper; deepest
1 : to a great depth : deeply
2 : 2late 1
  • She read deep into the night.

3

deep

noun

Definition of deep for Students

1 : a very deep place or part
  • the ocean deeps
2 : ocean 1
  • Pirates sailed the briny deep.
3 : the middle or most intense part
  • the deep of winter

Medical Dictionary

deep

adjective \ ˈdēp \

medical Definition of deep

1 a : extending well inward from an outer surface
  • a deep gash
b (1) : not located superficially within the body or one of its parts
  • deep pressure receptors in muscles
(2) : resulting from or involving stimulation of deep structures
  • deep pain
  • deep reflexes
2 : being below the level of the conscious
  • deep neuroses

deeply

adverb


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