Definition of insanity noun from the Oxford Advanced American Dictionary

     

    insanity

     noun
    noun
    NAmE//ɪnˈsænət̮i//
     
    [uncountable]
     
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  1. 1 the state of being insane He was found not guilty,by reason of insanity. opposite sanity
  2. 2actions that are very stupid and possibly dangerous synonym madness, lunacy It would be sheer insanity to attempt the trip in such bad weather.
See the Oxford Advanced Learner's Dictionary entry: insanity