1 [sik]
adjective, sicker, sickest.
afflicted with ill health or disease; ailing.
affected with nausea; inclined to vomit.
deeply affected with some unpleasant feeling, as of sorrow, disgust, or boredom: sick at heart; to be sick of parties.
mentally, morally, or emotionally deranged, corrupt, or unsound: a sick mind; wild statements that made him seem sick.
characteristic of a sick mind: sick fancies.
dwelling on or obsessed with that which is gruesome, sadistic, ghoulish, or the like; morbid: a sick comedian; sick jokes.
of, relating to, or for use during sickness: He applied for sick benefits.
accompanied by or suggestive of sickness; sickly: a sick pallor; the sick smell of disinfectant in the corridors.
disgusted; chagrined.
not in proper condition; impaired.
failing to sustain adequate harvests of some crop, usually specified: a wheat-sick soil.
containing harmful microorganisms: a sick field.
Now Rare. menstruating.
(used with a plural verb) sick persons collectively (usually preceded by the ).
call in sick, to notify one's place of employment by telephone that one will be absent from work because of being ill.
sick and tired, utterly weary; fed up: I'm sick and tired of working so hard!
sick at one's stomach, Chiefly Midland and Southern U.S. nauseated.
sick to one's stomach, Chiefly Northern, North Midland, and Western U.S. nauseated.

before 900; Middle English sik, sek, Old English sēoc; cognate with Dutch ziek, German siech, Old Norse sjūkr, Gothic siuks

1. infirm, indisposed. See ill. 2. nauseous, nauseated.

1. well, hale, healthy. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sick1 (sɪk)
1.  inclined or likely to vomit
2.  a.  suffering from ill health
 b.  (as collective noun; preceded by the): the sick
3.  a.  of, relating to, or used by people who are unwell: sick benefits
 b.  (in combination): sickroom
4.  deeply affected with a mental or spiritual feeling akin to physical sickness: sick at heart
5.  mentally, psychologically, or spiritually disturbed
6.  informal delighting in or catering for the macabre or sadistic; morbid: sick humour
7.  informal (often foll by of) Also: sick and tired disgusted or weary, esp because satiated: I am sick of his everlasting laughter
8.  (often foll by for) weary with longing; pining: I am sick for my own country
9.  pallid or sickly
10.  not in working order
11.  (of land) unfit for the adequate production of certain crops
12.  slang look sick to be outclassed
n, —vb
13.  an informal word for vomit
[Old English sēoc; related to Old Norse skjūkr, Gothic siuks, Old High German sioh]

sick2 (sɪk)
a variant spelling of sic

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

"set upon" (sick him!), 1845, dialectal variant of seek.

"unwell," O.E. seoc, from P.Gmc. *seukaz, of uncertain origin. The general Gmc. word (cf. O.N. sjukr, Dan. syg, O.S. siok, O.Fris. siak, M.Du. siec, O.H.G. sioh, Goth. siuks "sick, ill"), but in Ger. and Du. displaced by krank "weak, slim," probably originally with a sense of "twisted, bent" (see
crank). Meaning "having an inclination to vomit" is from 1614; sense of "tired or weary (of something)" is from 1597; phrase sick and tired of is attested from 1783. Meaning "mentally twisted" is from 1551 (though sense of "spiritually or morally corrupt" was in O.E.), revived 1955. Sick joke is from 1959; sicko (n.) is from 1977. Sickening "causing revulsion" is first recorded 1789. The noun meaning "those who are sick" was in O.E. Sickness is O.E. seocnesse; sickly "ailing" is recorded from c.1350.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

sick (sĭk)
adj. sick·er, sick·est

  1. Suffering from or affected with a disease or disorder.

  2. Of or for sick persons.

  3. Nauseated.

  4. Mentally ill or disturbed.

  5. Constituting an unhealthy environment for those working or residing within, as of a building.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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