(not in technical use as a medical diagnosis) not sane; This is also a slang word for acting wacky or wild. Insanity, madness, lunacy, and craziness are behaviors caused by certain abnormal mental or behavioral patterns. Her bizarre threats were the result of an insane jealousy. This song is about the character alastor, who is a very powerful demon. To be insane is to have a seriously disordered state of mind. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. See examples of insane used in a sentence. Meanings, etymology, pronunciation and more in the oxford english dictionary Definition of insane adjective in oxford advanced learners dictionary. · (slang) extremely good; He was a dj in the 1920s and also a. Afflicted with mental derangement, having a disordered mind, mad: Idk if youve ever watched hazbin hotel but its basically a show about life in hell. Not of sound mind; Quotations that guy is insane at fps games. Insane synonyms, insane pronunciation, insane translation, english dictionary definition of insane. The meaning of insane is exhibiting a severely disordered state of mind. How to use insane in a sentence. Insanity can manifest as violations of societal norms, including a person or persons becoming a danger to themselves or to other people. Very annoyed, angry, upset, or excited, often so that you cannot think or behave normally: