1. adjective /sɪk/
a) In poor health
She was sick all day with the flu
b) Mentally unstable, disturbed.
Thats a sick joke.
Syn: ill, well, poorly, sickly, unwell, disturbed, sick in the head, twisted, warped, nauseated, nauseous, cool, rad, wicked
2. noun /sɪk/
a) Those people as a group who are sick.
We have to cure the sick.
b) vomit.
He lay there in a pool of his own sick.
Wikipedia foundation.