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Definition of INSANITY

1
: a deranged state of the mind usually occurring as a specific disorder (as schizophrenia)
2
: such unsoundness of mind or lack of understanding as prevents one from having the mental capacity required by law to enter into a particular relationship, status, or transaction or as removes one from criminal or civil responsibility
3
a : extreme folly or unreasonableness
b : something utterly foolish or unreasonable