insane Meaning in the Cambridge English Dictionary
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Meaning of “insane” in the English Dictionary

"insane" in British English

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insaneadjective

uk   us   /ɪnˈseɪn/
C2 mentallyill: For the last ten ​years of his ​life he was clinically insane.informal I sometimes ​think I'm going insane (= I ​feel very ​confused).C1 extremelyunreasonable or ​stupid: It would be insane not to take ​advantage of this ​opportunity.

insanenoun [plural]

uk   us   /ɪnˈseɪn/
the insane mentallyillpeople: a ​hospital for the criminally insane
(Definition of insane from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"insane" in American English

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insaneadjective

 us   /ɪnˈseɪn/
extremelyunreasonable, or ​mentallyill: 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)
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