sick

The definition of sick is to have an illness, to be tired of something or sorrowful about something.

(adjective)

Sick is defined as a group of people collectively who are ill.

(noun)

An example of sick is the group of people in a cancer wing in a hospital.

See sick in Webster's New World College Dictionary

adjective

suffering from disease or illness; unwell; ill: in this sense, now rare or literary in England
having nausea; vomiting or about to vomit: the predominant sense in England
characteristic of or accompanying sickness: a sick expression
of or for sick people: sick leave
deeply disturbed or distressed; extremely upset, as by grief, disappointment, disgust, failure, etc.
disgusted by reason of excess; annoyed or exasperated: usually with of: sick of such excuses
often sick and tired
in poor condition; impaired; unsound
having a great longing or nostalgia (for): sick for the hills
of sickly color; pale
having a discharge of the menses; menstruating
mentally ill or emotionally disturbed
Informal sadistic, morbid, or abnormally unwholesome: a sick joke
☆ Agric.
1. incapable of producing an adequate yield of a certain crop: wheatsick soil
2. infested with harmful microorganisms: a sick field

Origin: ME sik, seke < OE seoc, akin to Ger siech < IE base *seug-, to be troubled or grieved > Arm hiucanim, (I) am weakening

transitive verb

sic

See sick in American Heritage Dictionary 4

adjective sick·er, sick·est

a. Suffering from or affected with a physical illness; ailing.
b. Of or for sick persons: sick wards.
c. Nauseated.
a. Mentally ill or disturbed.
b. Unwholesome, morbid, or sadistic: a sick joke; a sick crime.
Defective; unsound: a sick economy.
a. Deeply distressed; upset: sick with worry.
b. Disgusted; revolted.
c. Weary; tired: sick of it all.
d. Pining; longing: sick for his native land.
a. In need of repairs: a sick ship.
b. Constituting an unhealthy environment for those working or residing within: a sick office building.
Unable to produce a profitable yield of crops: sick soil.