Synonyms of birdbrains

1 Syllable
dolt, boob, dope, clown, clod, jerk, oaf
2 Syllables
blockhead, dimwit, lunkhead, numskull, fathead, stooge, dunce, idiot, buffoon, moron, nitwit
3 Syllables
bonehead, dunderhead, lamebrain
4 Syllables
ignoramus, imbecile