ill - definition and synonyms


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  1. 1
    not healthy, because of a medical condition or an injury. The usual American word is sick

    He’s been ill for a couple of weeks.

    She was too ill to travel.

    terminally ill (=going to die because of an illness)

    seriously/critically ill:

    Her husband is seriously ill in hospital.

    fall ill /be taken ill (=become ill):

    She was unlucky enough to fall ill on holiday.

    ill with:

    Samantha was seriously ill with a fever.

  2. 2
    [only before noun] bad, or harmful

    Their defeat was mainly due to their ill-discipline.

    The fish didn’t taste fresh, but we suffered no ill effects.

    ill temper/humour:

    Bouts of ill temper punctuated the match.