A silly or stupid person
nitwit, simpleton, dunce, ninny, cretin, nincompoop, dolt, idiot, jackass, ass, buffoon, blockhead, numskull, oaf, booby, boob, clod, dunderhead, goose, ignoramus, imbecile, moron, clown, tomfool, wiseacre, donkey, looby, noddy, noodle, innocent, loon, dullard, fathead, halfwit, mooncalf, lightweight, dotard, babbler, driveler, Simple Simon, silly, scatterbrain, bonehead*, simp*, dope*, nerd*, turkey*, dumbdumb*, meathead*, sap*, birdbrain*, lamebrain*, noodlehead*, *airhead*, bubblehead*, ditz*, dumb ox*, lunkhead*, knucklehead*, dimwit*, dumbbell*, jerk*, chump*, twit*, dumb bunny*.
Antonyms philosopher*, sage, scholar.
One made to seem foolish
butt, laughingstock, victim, clown, poor fish, schlemiel, dupe, gull, gudgeon, cully, stooge, fair game, goat*, pigeon*, sucker*, patsy*, fall guy*, pushover*, setup*, mark*, easy mark*, chump*.