mentally retarded Synonyms

retarded developmentally challenged crazy as a loon simpleminded out of one's head not the sharpest knife in the drawer muttonheaded developmentally delayed developmentally disabled unintelligent mentally challenged intellectually disabled imbecilic soft in the head thick as a brick mentally defective as crazy as a loon as crazy as a bedbug as dumb as a doorknob very stupid as dumb as a box of rocks not the full shilling thick as two short planks thick as mince thick as champ thick as a plank dunderheaded dumber than a rock simple imbecile idiotic half-witted foolish dumb dense cretinous crazy backward special stupid thick dumb as dirt dumb as a sack of hammers dumb as a post dumb as an ox dumb as a doorknob dumb as a box of rocks dumb as a bag of hammers crackbrained moronic