insanity

US /ɪnˈsænətɪ/

UK /ɪn'sænətɪ/

B1
n. (u.)Uncountable NounMentally ill, unable to act normally
The court ruled that the man was not guilty of the crime due to insanity
n. (u.)Uncountable NounExtremely foolish behavior.
It would be sheer insanity to invest all your money in that venture.

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