INSANITY

noun (plural -ties) Date: 1590 a deranged state of the mind usually occurring as a specific disorder (as schizophrenia), 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. extreme folly or unreasonableness, something utterly foolish or unreasonable