Synonyms and related words :
abnormal, arrested, babbling, backward, bereft of reason, blithering, brainsick, burbling, crackbrained, cracked, crazed, crazy, cretinistic, cretinous, daft, deluded, demented, deprived of reason, deranged, disoriented, distraught, dithering, driveling, drooling, flighty, half-baked, half-witted, hallucinated, idiotic, imbecile, imbecilic, insane, irrational, loco, lunatic, mad, maddened, manic, maundering, mazed, mental, mentally defective, mentally deficient, mentally handicapped, mentally retarded, meshuggah, mongoloid, moon-struck, moronic, non compos, non compos mentis, not right, odd, of unsound mind, off, psycho, queer, reasonless, retarded, senseless, sick, simple, simpleminded, simpletonian, slobbering, stark-mad, stark-staring mad, strange, subnormal, tetched, touched, unbalanced, unhinged, unsane, unsettled, unsound, wandering, witless