Definition of ill noun from the Oxford Advanced Learner's Dictionary

     

    ill

     noun
    noun
    BrE BrE//ɪl//
     
    ; NAmE NAmE//ɪl//
     
     
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  1. 1[usually plural] (formal) a problem or harmful thing; an illness social/economic ills the ills of the modern world
  2. 2[uncountable] (literary) harm; bad luck I may not like him, but I wish him no ill.
  3. Word Origin Middle English (in the senses ‘wicked’, ‘malevolent’, ‘harmful’, and ‘difficult’): from Old Norse illr ‘evil, difficult’, of unknown origin.
See the Oxford Advanced American Dictionary entry: ill