in·san·i·ty 
/ɪnˈsænəti/ noun
plural in·san·i·ties /ɪnˈsænəti/ noun 1 [noncount] : severe mental illness : the condition of being insane
▪ She was found not guilty by reason of insanity. ▪ temporary insanity 2 : something that is very foolish or unreasonable [noncount] ▪ His friends thought his decision to quit his job was pure insanity. ▪ Please, no more violence. It's time to stop this insanity. [count] ▪ the insanities of modern life
▪ She was found not guilty by reason of insanity. ▪ temporary insanity
