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



    BrE BrE//ˈluːnəsi//
    ; NAmE NAmE//ˈluːnəsi//
    [uncountable] Describing strange traits, Stupid
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  1. 1behaviour that is stupid or crazy synonym madness It's sheer lunacy driving in such weather. a comedy show full of inspired lunacy See related entries: Stupid
  2. 2(old-fashioned) mental illness synonym madness See related entries: Describing strange traits
  3. Word Originmid 16th cent. (originally referring to intermittent insanity believed to be caused by changes of the moon): from lunatic + -acy.
See the Oxford Advanced American Dictionary entry: lunacy