I've felt a little unwell all week.
Synonyms and examplesillDon't visit - I'm rather ill.
sickHe was sick last week.
poorlyUKinformalI'm afraid she's rather poorly and is not accepting visits.
ailingHe took care of his ailing mother.
sicklyShe was a sickly child.
under the weatherinformalI don't think I'll be coming to the party - I'm feeling a bit under the weather.
below/under parI've been feeling under par since winter.
Antonyms and exampleshealthyShe had a healthy baby girl last night.
wellHe hasn't been well for a while.
goodI was sick for a while, but now I'm feeling good.
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If you are sick, you arenot healthy, or you do not feel healthy.