Definition of lunacy noun from the Oxford Advanced American Dictionary

     

    lunacy

     noun
    noun
    NAmE//ˈlunəsi//
     
    [uncountable]
     
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  1. 1behavior that is stupid or crazy synonym madness It's sheer lunacy to drive in this weather.
  2. 2(old-fashioned) mental illness synonym madness
See the Oxford Advanced Learner's Dictionary entry: lunacy