The meaning of LUNACY is insanity.

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LUNACY definition: insanity; mental disorder. See examples of lunacy used in a sentence.

Definition of lunacy noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

LUNACY meaning: 1. stupid behaviour that will have bad results: 2. mental illness 3. stupid behavior that will…. Learn more.

If you describe someone's behaviour as lunacy, you mean that it seems very strange or foolish.

lunacy 1. periodic insanity, once thought to be caused by the phases of the moon. 2. any form of insanity. — lunatic, adj. See also: Insanity

Lunacy may refer to: Lunacy, the condition suffered by a lunatic, now used only informally Lunacy (film), a 2005 Jan Švankmajer film Lunacy (video game), a video game for the Sega Saturn …

Jul 10, 2025 · From lunatic +‎ -cy. lunacy (countable and uncountable, plural lunacies) A cyclical mental disease, apparently linked to the lunar phases. Insanity implying legal irresponsibility. …

lunacy, n. meanings, etymology, pronunciation and more in the Oxford English Dictionary