Synonyms of simpleton

1 Syllable

dolt, boob, dope, schnook, ass, clown, naif, schmuck, clod, fool, fools, schmoes, jerk, oaf, schmo, sap

2 Syllables

blockhead, meathead, beefhead, dullard, dumdums, dimwit, witling, birdbrain, lunkhead, morons, turkey, mooncalf, numskull, fathead, halfwit, dumbbell, oxen, jerked, airhead, bruiser, stooge, dunce, thickhead, ninny, idiot, buffoon, lame-brain, bruisers, schlemiel, greenhorn, softhead, lummox, greenhorns, hardhead, jestee, jerking, jughead, dummkopf, ding-dong, half-wit, moron, ninnies, nitwit

3 Syllables

muttonhead, knucklehead, bonehead, dunderhead, nincompoop, lamebrain, clodpate

4 Syllables

addlepate, ignoramus, imbecile