Synonyms of bonehead

1 Syllable
schnook, schmuck, clod, fool, fools, schmoes, schmo
2 Syllables
blockhead, saphead, beefhead, birdbrains, dimwit, birdbrain, turkey, muddler, mooncalf, numskull, screwball, fathead, fumbler, bumblers, ninnies, fumblers, dunce, duffer, ninny, idiot, muddlers, softhead, hardhead, bunglers, moron, bumbler, bungler, duffers, nitwit
3 Syllables
muttonhead, knucklehead, simpleton, dunderhead, nincompoop, addlebrain, featherbrain
4 Syllables
imbecile, mismanager