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English definition of “ill”

ill

adjective (NOT WELL)    /ɪl/
A2 not feeling well, or suffering from a disease : I felt ill so I went home . He's been ill with meningitis . Sophia fell ill/was taken ill (= became ill) while on holiday . He is critically (= very badly ) ill in hospital .Not fit and healthyThin or slender (of people) Grammar:Ill or sick?Ill and sick are both adjectives that mean ‘not in good health’. We use both ill and sick after a verb such as be, become, feel, look or seem:
(Definition of ill adjective (NOT WELL) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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