insanity

US /ɪnˈsæn.ə.t̬i/
UK /ɪnˈsæn.ə.t̬i/
"insanity" picture
1.

the state of being seriously mentally ill; madness.

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He was found not guilty by reason of insanity.
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The sheer insanity of the plan shocked everyone.
:
sanityreasonsoundness
:
insaneinsanely