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The definition of insane

Synonyms:	preposterous, daft (informal), mad, crazy, nuts (slang), cracked (slang), mental (slang), barking (slang), crackers (Brit. slang), craze, demented, cuckoo (informal), derange, loopy (informal), gaga (informal), screwy (informal), non compos mentis (Latin), porangi (N.Z.), stupid, foolish, bizarre, irresponsible, irrational, lunatic, senseless, impractical, idiotic, inane, fatuous
Antonyms:	reasonable, sane

From Collins