Synonyms of nincompoop

1 Syllable

goons, goon, dolt, boob, schnook, ass, schmuck, clod, fool, fools, schmoes, jerk, oaf, schmo

2 Syllables

blockhead, seefool, beefhead, lunkhead, turkey, mooncalf, numskull, fathead, halfwit, oxen, bruiser, dunce, ninny, idiot, bruisers, schlemiel, softhead, lummox, hardhead, ding-dong, moron, ninnies, witling, nitwit

3 Syllables

muttonhead, knucklehead, bonehead, simpleton

4 Syllables

imbecile