Of or pertaining to one who is of unsound mind A legal rather than a psychiatric term
disapproval If you describe a decision or action as insane, you think it is very foolish or excessive. I said, `Listen, this is completely insane.' + insanely in·sane·ly I would be insanely jealous if Bill left me for another woman
afflicted with or characteristic of mental derangement; "was declared insane"; "insane laughter
Term used imprecisely in the federal population censuses to indicate a person who had once possessed mental faculties that had become impaired
afflicted with or characteristic of mental derangement; "was declared insane"; "insane laughter"
very foolish; "harebrained ideas"; "took insane risks behind the wheel"; "a completely mad scheme to build a bridge between two mountains"
Someone who is insane has a mind that does not work in a normal way, with the result that their behaviour is very strange. Some people simply can't take it and they just go insane = mad