Afflicted with or exhibiting irrationality and mental unsoundness:
brainsick, crazy, daft, demented, disordered, distraught, insane, lunatic, mad, maniac, maniacal, mentally ill, moonstruck, off, touched, unbalanced, unsound, wrong. (Informal) bonkers, cracked, daffy, gaga, loony. (Slang) bananas, batty, buggy, cuckoo, fruity, loco, nuts, nutty, screwy, wacky. (Chiefly British) crackers. (Law) non compos mentis. Idioms: around the bend, crazy as a loon, mad as a hatter, not all there, nutty as a fruitcake, off (or out of) one's head, off one's rocker, of unsound mind, out of one's mind, sick in the head, stark raving mad. See saneLearn more about dotty