Synonyms for Bonehead:

n.

dork, cow, jerk, wanker, deadhead, spastic. •bonehead (noun)
hammerhead, dunderhead, numskull, lunkhead, muttonhead, dunce, loggerhead, blockhead, knucklehead.
•bungler (noun)
clown, bumbler, oaf, fumbler, botcher, yokel, butter-fingers, clodhopper, blunder-head, goof.
•fool (noun)
dullard, nincompoop, blockhead, bungler, half-wit, nitwit, dunce, knuckle-head, loon, lame-brain, crackpot, dimwit, moron, ignoramus, chuckle-head, meathead, imbecile, simpleton, dummy, dolt, fool, dumbbell, cretin, clod.
•idiot (noun)
blockhead, imbecile, dunce, nincompoop, clod, fool, nitwit, moron.
•ignoramus (noun)
birdbrain, scatterbrain, buffoon.
•stupid person (noun)
dunce.

Other synonyms:

•Other relevant words:
jerk, dork, deadhead, knucklehead, loggerhead, dunderhead, numskull, cow, wanker, hammerhead, lunkhead, spastic, muttonhead.

Usage examples for bonehead

1. Then there was that bonehead play, when, with Hinsdale on third and Hodge on first, he had given the signal for Hodge to make a break for second, so as to draw a throw from the catcher and thus let Hinsdale get in from third. – Bert Wilson's Fadeaway Ball by J. W. Duffield