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Definition of insanity noun from the Oxford Advanced American Dictionary

insanity

noun
/ɪnˈsænəi/ insanity pronunciation American
[uncountable]
 
1 the state of being insaneHe was found not guilty, by reason of insanity. antonym sanity2 actions that are very stupid and possibly dangerous synonym madness, lunacyIt would be sheer insanity to attempt the trip in such bad weather.