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