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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.
Agriculture.

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.
sic1 .
to attack (used especially in commanding a dog):
Sic ’em!
to incite to attack (usually followed by on).
Contemporary Examples

Hallucinating Away a Heroin Addiction Abby Haglage May 3, 2014
Hosni Mubarak’s Final Tragedy Christopher Dickey February 12, 2011
Brooklyn Is the New Guantánamo for Three Suspected Al-Shabab Members Michael Daly September 25, 2013
Michel Gondry on ‘Mood Indigo,’ Kanye West, and the 10th Anniversary of ‘Eternal Sunshine’ Marlow Stern July 19, 2014
Pass the Christmas Pork, Please Lee Siegel December 23, 2009

Historical Examples

Sir Henry Morgan, Buccaneer Cyrus Townsend Brady
Harriet, The Moses of Her People Sarah H. Bradford
The Untroubled Mind Herbert J. Hall
Life and Death of Harriett Frean May Sinclair
The Adventures of the Chevalier De La Salle and His Companions, in Their Explorations of the Prairies, Forests, Lakes, and Rivers, of the New World, and Their Interviews with the Savage Tribes, Two Hundred Years Ago John S. C. Abbott

adjective
inclined or likely to vomit

suffering from ill health
(as collective noun; preceded by the): the sick

of, relating to, or used by people who are unwell: sick benefits
(in combination): sickroom

deeply affected with a mental or spiritual feeling akin to physical sickness: sick at heart
mentally, psychologically, or spiritually disturbed
(informal) delighting in or catering for the macabre or sadistic; morbid: sick humour
(often foll by of) (informal) Also sick and tired. disgusted or weary, esp because satiated: I am sick of his everlasting laughter
(often foll by for) weary with longing; pining: I am sick for my own country
pallid or sickly
not in working order
(of land) unfit for the adequate production of certain crops
(slang) look sick, to be outclassed
noun, verb
an informal word for vomit
verb
a variant spelling of sic2
adverb
so or thus: inserted in brackets in a written or printed text to indicate that an odd or questionable reading is what was actually written or printed
verb (transitive) sics, sicking, sicked
to turn on or attack: used only in commands, as to a dog
to urge (a dog) to attack
determiner, adverb
a Scot word for such
v.
adj.
n.
adv.

[I]t amounts to Yes, he did say that, or Yes, I do mean that, in spite of your natural doubts. It should be used only when doubt is natural; but reviewers & controversialists are tempted to pretend that it is, because (sic) provides them with a neat & compendious form of sneer. [Fowler]

Sic passim is “generally so throughout.”
v.

A dishonest and contemptible lawyer, politician, or businessperson: You lousy little shyster bastard (1844+)
Any lawyer

standard industry classification

sick and tired
sick as a dog
sick at heart
sick in bed
sick joke
sick to one’s stomach