Synonyms and related words :
abnormal, bereft of reason, brainsick, crackbrained, cracked, crazed, crazy, daft, deluded, demented, deprived of reason, deranged, disarranged, disjointed, dislocated, disoriented, displaced, distraught, flighty, hallucinated, insane, irrational, loco, lunatic, mad, maddened, manic, mazed, mental, mentally deficient, meshuggah, moon-struck, non compos, non compos mentis, not all there, not right, odd, of unsound mind, off, out, out of gear, out of joint, psycho, queer, reasonless, senseless, sick, stark-mad, stark-staring mad, strange, tetched, touched, unbalanced, unjointed, unsane, unsettled, unsound, wandering, witless