Definition from macmillandictionary.com
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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 hospital.
She was unlucky enough to fall ill on holiday.
Samantha 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.