insanitynoun [ U ]
uk/ɪnˈsæn.ə.ti/us/ɪnˈsæn.ə.t̬i/the condition of being seriously mentally ill:
He was found not guilty of murder by reason of insanity.
He suffered from periodic bouts of insanity.
an action that is stupid and likely to have extremely bad results:
It would be insanity to expand the business now.
Thesaurus: synonyms and related words
Of unsound mind
- around the bend idiom
- bat
- batshit
- battle-scarred
- beside
- crackers
- disturbed
- fruitcake
- gaga
- loon
- lose
- mad
- maniac
- nutcase
- off your trolley idiom
- psychopath
- schizo
- screwy
- trolley
- unhinged
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Stupid and silly