See madness in Webster's New World Roget's A-Z Thesaurus II
noun
Serious mental illness or disorder impairing a person's capacity to function normally and safely:
brainsickness, craziness, dementia, derangement, disturbance, insaneness, insanity, lunacy, mental illness, psychopathy, unbalance. (Psychiatry) mania. (Psychology) aberration, alienation. See saneFoolish behavior:
absurdity, folly, foolery, foolishness, idiocy, imbecility, insanity, lunacy, nonsense, preposterousness, senselessness, silliness, tomfoolery, zaniness. (Informal) craziness. See ability
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