Meaning of insanity in English
insanity
noun [ U ]
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/ɪnˈsæn.ə.ti/
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/ɪnˈsæn.ə.t̬i/

the condition of being seriously mentally ill:

He was found not guilty of murder by reason of insanity.

bout of insanity He suffered from periodic bouts of insanity.

an action that is stupid and likely to have extremely bad results:

It would be insanity to expand the business now.

insanity
noun [ U ]
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/ɪnˈsæn·ɪ·t̬i/

mental illness:

The jury found him innocent on the grounds of temporary insanity.