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noun noun: insanity the state of being seriously mentally ill; madness. "he suffered from bouts of insanity" synonyms: mental illness, mental disorder, mental derangement, madness, insaneness, dementia, dementedness, lunacy, instability, unsoundness of mind, loss of reason; More antonyms: sanity extreme foolishness or irrationality. plural noun: insanities "it might be pure insanity to take this loan" synonyms: folly, foolishness, foolhardiness, idiocy, stupidity, imbecility, asininity, lunacy, madness, silliness, senselessness, brainlessness, thoughtlessness, irrationality, illogicality, absurdity, ludicrousness, ridiculousness;
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