deep

1 of 3

adjective

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 deep entry 2 sense 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 pitch entry 4 sense 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 bullpen
deeply adverb
deepness noun

deep

2 of 3

adverb

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 sense 6
threw deep to the wide receiver
hit the ball deep to right field

deep

3 of 3

noun

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 mark entry 1 sense 2b)
Phrases
in deep water
: in difficulty or distress
Choose the Right Synonym for 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

Example Sentences

Adjective We walked in the deep snow. a deep valley between the mountains The water is deepest in the middle of the lake. She's afraid of swimming in deep water. a plant with deep roots The house has lots of deep closets. She has a small but deep wound on her arm. This enormous canyon is over a mile deep. The shelves are 10 inches deep. He stepped into an ankle-deep puddle of mud. Adverb The ship now lies deep below the water's surface. Our feet sank deeper into the mud. The treasure was buried deep within the ground. Their secret offices were located deep underground. We walked deep into the forest. The soldiers are operating deep within enemy territory. I stood three feet deep in the water. He stepped ankle-deep into a puddle of mud. Noun the kind of cold weather that we usually have only in the deep of winter sailors exploring the farther reaches of the briny deep See More
Recent Examples on the Web
Adjective
This year’s team will be deep but very young and inexperienced. Joe Magill, cleveland, 17 Nov. 2022 Nathaniel Hackett may be a Mile High but his offense is barely an inch deep. Jeremy Cluff, The Arizona Republic, 16 Nov. 2022 His feelings might not be that deep, and that’s cool, too. Meg Donohue, ELLE, 16 Nov. 2022 With deep seats and mid-height back cushions, this sectional is made for lounging. Molly Miller, Better Homes & Gardens, 14 Nov. 2022 The cuts aren’t as deep as a previous plan that faced sharp criticism, but the plan could still have dramatic ripple effects. Laura Blasey, Los Angeles Times, 12 Nov. 2022 The Dump Trump crowd, though bigger at the moment than at perhaps any time since 2016, does not seem to fully understand how deep and unquestioning the cult of personality around Trump still is within parts of the party. Nicole Hemmer, CNN, 11 Nov. 2022 After a cageside doctor assessed that Nemkov’s cut was too deep for the bout to continue, the fight was halted with 5 seconds left in round 3. Jim Chairusmi, WSJ, 11 Nov. 2022 The degree to which my depression abated might correlate with, and perhaps depend upon, how deep my spiritual experience had been. Daniel Burke, Washington Post, 10 Nov. 2022
Adverb
Airborne dust emissions — PM10 particles — now meet environmental limits in the region, but concentrations of smaller PM2.5 particles that can reach deep into the lungs and bloodstream still do not hit World Health Organization standards. Karel Janicek, ajc, 18 Nov. 2022 If Ukraine did inadvertently shoot an SA-10 missile deep into Polish territory, this would not be the first case of a Soviet-era missile defense system missing its mark. John Hudson, Washington Post, 17 Nov. 2022 Celebrities ranging from Emily Ratajkowski to Jennifer Lopez have been diving deep into the look. Kristen Bateman, ELLE, 17 Nov. 2022 If Ukraine did inadvertently shoot an SA-10 missile deep into Polish territory, this would not be the first case of a Soviet-era missile defense system missing its mark. John Hudson, Anchorage Daily News, 17 Nov. 2022 Stralman is old by NHL standards, as are fellow 30-somethings Patrice Bergeron, David Krejci, and now even Brad Marchand, but his experience could prove invaluable if the Bruins work deep into a playoff run. Kevin Paul Dupont, BostonGlobe.com, 17 Nov. 2022 On top of the popular sports listed above, the DraftKings betting menu runs deep with odds for cricket, darts, cycling, lacrosse, handball, rugby, motorsports, and much more. Brian Sausa | Catena Media, al, 15 Nov. 2022 On the next play, Herbert connected deep with Carter for 33 yards to the San Francisco two-yard line. Los Angeles Times, 14 Nov. 2022 No one played more than 24 minutes as coach Brian Dutcher went 10 deep with his initial rotation: nine veterans plus true freshman Elijah Saunders. Mark Zeigler, San Diego Union-Tribune, 11 Nov. 2022
Noun
This machine does all of the heavy lifting in the form of deep-keading, compression, and heat. Roxanne Adamiyatt, Town & Country, 15 Nov. 2022 That was Aumavae, a true freshman who this week is listed as the backup to Burmeister on SDSU’s two-deep for Saturday night’s game against Hawaii. San Diego Union-Tribune, 3 Oct. 2022 Auburn also made a couple changes at receiver on the two-deep: Koy Moore and Malcolm Johnson Jr. are listed as co-starters at the Z-receiver spot, while converted tight end Landen King has supplanted Tar’Varish Dawson Jr. as the No. 2 in the slot. Tom Green | Tgreen@al.com, al, 26 Sep. 2022 Puaoi connected with Hampton again on a one-play drive for a 10-yard touchdown after his defense set them up with short field by forcing a fumble deep in Bartlett territory. Josh Reed, Anchorage Daily News, 2 Oct. 2022 Ohio State does not release an official depth chart, but this is our read on the two-deep based on game usage, practice intel and interviews. Nathan Baird, cleveland, 28 Sep. 2022 Tate Johnson, who started the first four games of the season, was not listed on the two-deep after exiting the Missouri game with an injury. Tom Green | Tgreen@al.com, al, 26 Sep. 2022 Running back Donovan Edwards is among three players on the two-deep of Michigan football's depth chart who will miss Saturday's game against Connecticut in Ann Arbor. Michael Cohen, Detroit Free Press, 17 Sep. 2022 As a prospect, Sierveld provides depth on the interior as a player who could be ready to compete for a spot in the two-deep by Year 2. Stephen Means, cleveland, 4 May 2022 See More

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.

Word History

Etymology

Adjective, Adverb, and Noun

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

First Known Use

Adjective

before the 12th century, in the meaning defined at sense 1

Adverb

before the 12th century, in the meaning defined at sense 1

Noun

before the 12th century, in the meaning defined at sense 1a

Time Traveler
The first known use of deep was before the 12th century

Dictionary Entries Near deep

Cite this Entry

“Deep.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/deep. Accessed 1 Dec. 2022.

Kids Definition

deep 1 of 3

adjective

1
a
: extending far downward
a deep well
b
: having a great distance between the top and bottom surfaces : not shallow
deep water
c
: extending well inward from an outer or front surface
a deep gash
d
: extending far outward from a center
deep space
e
: occurring or located near the outer limits
deep right field
2
: having a specified extension downward or backward
a shelf 40 centimeters deep
3
a
: difficult to understand
a deep book
b
: mysterious, obscure
a deep dark secret
c
: profound sense 1
a deep thinker
d
: completely absorbed
deep in thought
e
: being to an extreme degree : heavy
deep sleep
4
a
: dark and rich in color
a deep red
b
: having a low musical pitch or range
a deep voice
5
a
: coming from or located well within
a deep sigh
a house deep in the forest
b
: covered, enclosed, or filled often to a specified degree
knee-deep in water
a road deep with snow
deeply adverb

deep

2 of 3

adverb

1
: to a great depth : deeply
2
: far on : late
read deep into the night
3
: near the outer limits
the shortstop was playing deep

deep

3 of 3

noun

1
a
: an extremely deep place or part (as of the ocean)
2
: the middle or most intense part
the deep of night

Medical Definition

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

More from Merriam-Webster on deep

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