noun

insanity

insanity, madness, craziness

He was found not guilty by reason of insanity.

He was found not guilty by reason of insanity.

It would be insanity to quit your job now.

It would be insanity to quit your job now.

the insanity of (sth./-ing) the state of being insane It would be insanity to quit your job now.

Synonyms: madness, lunacy, craziness; Antonyms: sanity, reason

From 'insane' + the noun-forming suffix '-ity'. It means 'the state of being not sane'.

It's the noun form of 'insane'. If an act is insane, the state of mind behind it is insanity.

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