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