adjective, thicker, thickest.
having relatively great extent from one surface or side to the opposite; not thin: a thick slice.
measured, as specified, between opposite surfaces, from top to bottom, or in a direction perpendicular to that of the length and breadth; (of a solid having three general dimensions) measured across its smallest dimension: a board one inch thick.
composed of or containing objects, particles, etc., close together; dense: a thick fog; a thick forest.
filled, covered, or abounding (usually followed by with ): tables thick with dust.
husky or hoarse; not distinctly articulated: The patient's speech is still quite thick.
markedly so (as specified): a thick German accent.
deep or profound: thick darkness.
(of a liquid) heavy or viscous: a thick syrup.
Informal. close in friendship; intimate.
mentally slow; stupid; dull.
disagreeably excessive or exaggerated: They thought it a bit thick when he called himself a genius.
adverb, thicker, thickest.
in a thick manner.
close together; closely packed: The roses grew thick along the path.
in a manner to produce something thick: Slice the cheese thick.
the thickest, densest, or most crowded part: in the thick of the fight.
lay it on thick, Informal. to praise excessively; flatter: He's laying it on thick because he wants you to do him a favor.
through thick and thin, under favorable and unfavorable conditions; steadfastly: We have been friends for 20 years, through thick and thin.

before 900; (adj. and adv.) Middle English thikke, Old English thicce; cognate with Dutch dik, German dick; akin to Old Norse thykkr (noun) Middle English, derivative of the adj.

thickish, adjective
thickly, adverb
overthick, adjective
overthickly, adverb
overthickness, noun
superthick, adjective
unthick, adjective
unthickly, adverb
unthickness, noun

6. strong, pronounced, decided. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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World English Dictionary
thick (θɪk)
1.  of relatively great extent from one surface to the other; fat, broad, or deep: a thick slice of bread
2.  a.  (postpositive) of specific fatness: ten centimetres thick
 b.  (in combination): a six-inch-thick wall
3.  having a relatively dense consistency; not transparent: thick soup
4.  abundantly covered or filled: a piano thick with dust
5.  impenetrable; dense: a thick fog
6.  stupid, slow, or insensitive: a thick person
7.  throaty or badly articulated: a voice thick with emotion
8.  (of accents, etc) pronounced
9.  informal very friendly (esp in the phrase thick as thieves)
10.  (Brit) a bit thick unfair or excessive
11.  informal a thick ear a blow on the ear delivered as punishment, in anger, etc
12.  in order to produce something thick: to slice bread thick
13.  profusely; in quick succession (esp in the phrase thick and fast)
14.  informal lay it on thick
 a.  to exaggerate a story, statement, etc
 b.  to flatter excessively
15.  a thick piece or part
16.  the thick the busiest or most intense part
17.  through thick and thin in good times and bad
[Old English thicce; related to Old Saxon, Old High German thikki, Old Norse thykkr]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. þicce "not thin, dense," from P.Gmc. *theku-, *thekwia- (cf. O.S. thikki, O.H.G. dicchi, Ger. dick, O.N. þykkr, O.Fris. thikke), from PIE *tegu- "thick" (cf. Gaelic tiugh). Secondary O.E. sense of "close together" is preserved in thickset and proverbial
phrase thick as thieves (1833). Meaning "stupid" is first recorded 1597. Phrase thick and thin is in Chaucer (c.1386); thick-skinned is attested from 1545; in fig. sense from 1602. Verb thicken is first recorded c.1425 (trans.), 1598 (intrans.); an earlier verb was O.E. þiccian. To be in the thick of some action, etc., "to be at the most intense moment" is from 1681, from a M.E. noun sense.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

thick (thĭk)
adj. thick·er, thick·est

  1. Relatively great in extent from one surface to the opposite, usually in the smallest solid dimension; not thin.

  2. Measuring a specified number of units in this dimension.

  3. Heavy in form, build, or stature; thickset.

  4. Having component parts in a close, crowded state or arrangement; dense.

  5. Having or suggesting a heavy or viscous consistency.

  6. Having a great number; abounding.

  7. Impenetrable by the eyes.

  8. Not easy to hear or understand; indistinctly articulated.

  9. Noticeably affecting sound; conspicuous.

  10. Producing indistinctly articulated sounds.

  1. In a close, compact state or arrangement; densely.

  2. In a thick manner; deeply or heavily.

The most active or intense part.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Idioms & Phrases


In addition to the idioms beginning with thick, also see blood is thicker than water; lay it on thick; plot thickens; through thick and thin.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
He creates what amount to relief structures by laying the paint in dense, thick
  layers on canvases that project from the wall.
Packed with sawdust in the thick-walled, partially buried building, the blocks
  would stay frozen well into summer.
The result is a flexible transistor a few millimetres thick.
Drawing the roll out produces long threads a few hundred microns thick that can
  be as reflective as gold.
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