Definition of “insane” - English Dictionary

(Definition of “insane” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“insane” in American English

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us /ɪnˈseɪn/

extremely unreasonable, or mentally ill:

You’d have to be insane to spend $200 on dinner!
Fisher went insane and had to be hospitalized.

(Definition of “insane” from the Cambridge Academic Content Dictionary © Cambridge University Press)