Synonyms of dunderhead

1 Syllable
dolt, boob, dope, schnook, clown, schmuck, clod, fool, fools, schmoes, jerk, oaf, schmo
2 Syllables
blockhead, birdbrains, dimwit, birdbrain, lunkhead, turkey, mooncalf, numskull, fathead, stooge, dunce, ninny, idiot, buffoon, softhead, jughead, half-wit, moron, ninnies, nitwit
3 Syllables
bonehead, simpleton, lamebrain
4 Syllables
ignoramus, imbecile