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WordReference Random House Learner's Dictionary of American English © 2024lu•na•cy /ˈlunəsi/USA pronunciation n., pl. -cies. - [uncountable] insanity;
mental disorder. - extreme foolishness or an instance of it: [uncountable]The decision to resign was sheer lunacy.[countable]sick of their lunacies.
WordReference Random House Unabridged Dictionary of American English © 2024lu•na•cy (lo̅o̅′nə sē),USA pronunciation n., pl. -cies. - insanity;
mental disorder. - intermittent insanity, formerly believed to be related to phases of the moon.
- extreme foolishness or an instance of it:Her decision to resign was sheer lunacy.
- Lawunsoundness of mind sufficient to incapacitate one for civil transactions.
- 1.See corresponding entry in Unabridged derangement, dementia; craziness, madness, mania, aberration.
- 3.See corresponding entry in Unabridged folly, stupidity.
- 1, 2.See corresponding entry in Unabridged rationality, sanity.
Collins Concise English Dictionary © HarperCollins Publishers:: lunacy /ˈluːnəsɪ/ n ( pl -cies)- (formerly) any severe mental illness
- foolishness or a foolish act
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