dunce

Synonyms: ass birdbrain blockhead bonehead buffoon dimwit dolt donkey dope dork drip dullard dunderhead fool goof goof ball half-wit idiot ignoramus imbecile jerk knucklehead lame-brain lightweight moron nerd nincompoop ninny nitwit numskull oaf pinhead scatterbrain schnook simpleton twit

Antonyms: brain genius