Synonyms and related words :
absolute, arrested, babbling, backward, blasted, blessed, burbling, crackbrained, cracked, crazy, cretinistic, cretinous, dithering, downright, driveling, drooling, gross, half-baked, half-witted, idiotic, imbecile, imbecilic, maundering, mentally defective, mentally deficient, mentally handicapped, mentally retarded, mongoloid, moronic, not all there, out-and-out, outright, positive, rank, retarded, simple, simpleminded, simpletonian, slobbering, subnormal