| Non Compos Mentis (exp.) Not of sound mind; not having the regular use of reason; hence, also, as a noun, an idiot; a lunatic; one devoid of reason, either by nature or from accident. Thesaurus Entries 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 |