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The meaning of LUNACY is insanity.

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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.

Great or wild foolishness. A policy that proved to be a piece of economic lunacy.

Jan 20, 2026 · Noun lunacy (countable and uncountable, plural lunacies) (of a person or group of people) The state of being mad, insanity A cyclical mental disease, apparently linked to the …

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

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

Lunacy is acting silly or stupid. Your mom might yell, "It's lunacy to go out in the snow wearing those flip flops!"