What is the meaning of Sick?

In poor health; ill.

Having an urge to vomit.

Mentally unstable, disturbed.

In bad taste.

Tired of or annoyed by something [with of].

Very good, excellent, awesome, badass.

In poor condition.

Failing to sustain adequate harvests of crop, usually specified.

Vomit.

(especially in the phrases on the sick and on long-term sick) Any of various current or former benefits or allowances paid by the Government to support the sick, disabled or incapacitated.

To vomit.

To fall sick; to sicken.

Alternative spelling of sic (set upon)

Source: wiktionary.org