Main Entry: in·san·i·ty

Pronunciation: \in-ˈsa-nə-tē\

Function: noun

Inflected Form(s): plural in·san·i·ties

Date: 1590

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