Definition of insane in English:


Syllabification: in·sane
Pronunciation: /inˈsān


1In a state of mind that prevents normal perception, behavior, or social interaction; seriously mentally ill: certifying patients as clinically insane he had gone insane
More example sentences
  • And anyway, why would we consider Nietzsche's writings the product of an insane mind?
  • But them my parents would think I was mentally insane, and send me off to some special school.
  • It was one of those awkward silences that made me want to scream and break my mirror to prevent myself from going insane.
mentally ill, mentally disordered, of unsound mind, certifiable;
psychotic, schizophrenic;
vulgar slang batshit
1.1(Of an action or quality) characterized or caused by madness: charging headlong in an insane frenzy his eyes glowing with insane fury
More example sentences
  • There was an insane feeding frenzy going on inside the reception tent.
  • He is propelled into an insane frenzy.
  • He lay on his back, knocked down by Michelle's flying fists that connected with his jaw in an insane fury.
maniacal, psychotic, crazed, hysterical
1.2In a state of extreme annoyance or distraction: a fly whose buzzing had been driving me insane
mad, crazy;
angry, furious, annoyed
informal aggravated, foaming at the mouth, hot under the collar
1.3(Of an action or policy) extremely foolish; irrational or illogical: she had an insane desire to giggle
More example sentences
  • At the same time, all this does is alienate liberal supporters who are perplexed by her insane and pointless maneuvring.
  • For people to go out and say my agent made a mistake is utterly ridiculous and insane.
  • I am baffled at the ridiculous insane media coverage.
impracticable, implausible, irrational, illogical
informal crazy, mad, cockeyed, daft


mid 16th century: from Latin insanus, from in- 'not' + sanus 'healthy'.



More example sentences
  • When I first saw it, I thought it was from some super fantastic and insanely expensive brand!
  • No doubt if Brittany and Jess had have been there, they'd have been telling me to stop being so insanely stupid and make the most of it.
  • He laughed as if the thought of it all was so insanely absurd, but true nonetheless.

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having an extremely offensive smell