Definition of insane in English:

insane

Syllabification: in·sane
Pronunciation: /inˈsān
 
/

adjective

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.
Synonyms
mentally ill, mentally disordered, of unsound mind, certifiable; psychotic, schizophrenic; mad, deranged, demented, out of one's mind, non compos mentis, unhinged, unbalanced, unstable, disturbed, crazed
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.
Synonyms
maniacal, psychotic, crazed, hysterical
1.2In a state of extreme annoyance or distraction: a fly whose buzzing had been driving me insane
Synonyms
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.
Synonyms
foolish, idiotic, stupid, silly, senseless, nonsensical, absurd, ridiculous, ludicrous, lunatic, preposterous, fatuous, inane, asinine, harebrained, half-baked; impracticable, implausible, irrational, illogical
informal crazy, mad, cockeyed, daft

Origin

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

Derivatives

insanely

adverb
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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