Synonyms of birdbrain

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