Synonyms and related words :
arrested, backward, blithering, bubbling, burbling, crackbrained, cracked, crazy, cretinistic, cretinous, delirious, dithering, dizzy, driveling, drooling, giddy, guggling, gurgling, half-baked, half-witted, idiotic, imbecile, imbecilic, incoherent, lapping, lightheaded, maundering, mentally defective, mentally deficient, mentally handicapped, mentally retarded, mongoloid, moronic, not all there, off, plashing, rambling, ranting, raving, retarded, rippling, simple, simpleminded, simpletonian, slobbering, sloshing, splashing, subnormal, swishing, trilling, wandering