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Definition of ill adverb from the Oxford Advanced American Dictionary

     

    ill

     adverb
    adverb
    NAmE//ɪl//
     
     
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  1. 1(especially in compounds) badly or in an unpleasant way The animals had been grossly ill-treated.
  2. 2(formal) badly; not in an acceptable way They live in an area ill served by public transport.
  3. 3(formal) only with difficulty We're wasting valuable time, time we can ill afford. I can ill afford the time or the money for a vacation.
  4. Idioms
    speak/think ill of somebody (formal)
     
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    to say or think bad things about someone Don't speak ill of the dead.
See ill in the Oxford Advanced Learner's Dictionary