ill adjective, adverb, noun Meaning in Cambridge English Dictionary
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Meaning of "ill" - English Dictionary

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illadjective

uk   us   /ɪl/

ill adjective (NOT WELL)

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.
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ill adjective (BAD)

C1 [before noun] formal or old-fashioned bad: ill health Did you experience any ill effects from the treatment?

illadverb

uk   us   /ɪl/
literary badly: He treated her very ill.speak ill of sb formal or old-fashioned to say unkind things about someone: I realize one shouldn't speak ill of the dead.augur/bode ill formal or old-fashioned to be a sign of bad things in the future: This weather bodes ill for the garden party tonight.can ill afford (to do sth) formal or old-fashioned If you can ill afford to do something, it will cause problems for you if you do it: We can ill afford to lose another member of staff.

illnoun

uk   us   /ɪl/
[U] formal or old-fashioned harm: I wish her no ill. [C usually plural] a problem: There seems to be no cure for the country's economic/social ills.
(Definition of ill adjective, adverb, noun from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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