i think these word sum this up....
ass, birdbrain, blockhead, bonehead, boob, bore, buffoon, butt, chump, clod, clown, cretin, dimwit, dolt, donkey, dope, dork, dumb ox, dunce, dunderhead, dupe, easy mark, fair game, fall guy, fathead, goat, gomeral, gomeril, goose, halfwit, idiot, ignoramus, illiterate, imbecile, innocent, jackass, jerk, lamebrain, laughing stock, lightweight, loon, lunkhead, meathead, moron, nerd, nincompoop, ninny, nitwit, numskull, oaf, omadawn, ownshook, pushover, sap, schlemiel, silly, simpleton, stooge, sucker, turkey, twerp, twit