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He’s been ill for a couple of weeks.
She was too ill to travel.
mentally ill patients
terminally ill (=going to die because of an illness)
Her husband is seriously ill in the hospital.
She was unlucky enough to fall ill on vacation.
Sarah was seriously ill with a fever.
Their defeat was mainly due to their ill-discipline.
The fish didn’t taste fresh, but we suffered no ill effects.
Bouts of ill temper punctuated the match.
This is the American English definition of ill. View British English definition of ill.