…Insanity. Insanity [in-san-i-tee]— n , pl -ties 1. relatively permanent disorder of the mind; state or condition of being insane 2. law a defect of reason as a result of mental illness, such that a defendant does not know what he or she is doing or that it is wrong 3. utter folly; stupidity Also: Per Albert Einstein: Insanity: doing the…