Definition of insane in English:

insane

Line breaks: in¦sane
Pronunciation: /ɪnˈseɪn
 
/

adjective

1In a state of mind which prevents normal perception, behaviour, or social interaction; seriously mentally ill: 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
1.1(Of an action or quality) characterized or caused by madness: his eyes were 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.
1.2Extremely annoyed: a fly whose buzzing had been driving me insane
Synonyms
mad, crazy; angry, annoyed, irritated, cross, vexed, exasperated, incensed, enraged
British informal spare, crackers
1.3Extremely foolish; irrational: 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
extremely foolish, idiotic, stupid, silly, senseless, nonsensical, pointless, absurd, ridiculous, ludicrous, farcical, laughable, preposterous, weird, bizarre, fatuous, inane, imbecilic, moronic, asinine, mindless, hare-brained, half-baked, ill-conceived; impracticable, untenable, implausible, unreasonable, irrational, illogical, unrealistic, unthinkable
informal potty, crazy, mad, off beam, way out, full of holes, cock-eyed
British informal daft, barmy

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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