Having an urge to vomit.
In poor health.
She was sick all day with the flu.
Mentally unstable, disturbed.
In bad taste.
That's a sick joke.
Tired of or annoyed by something.
I've heard that song on the radio so many times that I'm starting to get sick of it.
Very good, excellent, awesome, badass.
Dude, this car's got a sick subwoofer!
In poor condition.
sick building syndrome; my car is looking pretty sick; my job prospects are pretty sick
Failing to sustain adequate harvests of crop, usually specified.
(obsolete outside dialectal) Certain.
I'm sicker that he's not home.
(obsolete outside dialectal) Secure, safe.
To walk a sicker path
(obsolete outside dialectal) Certainly.
(obsolete outside dialectal) Securely.
To percolate, trickle, or ooze, as water through a crack.