numskull(n = noun.person) blockhead, bonehead, dumbass, dunce, dunderhead, fuckhead, hammerhead, knucklehead, loggerhead, lunkhead, muttonhead, shithead - a stupid person; these words are used to express a low opinion of someone's intelligence;
is a kind of dolt, dullard, pillock, poor fish, pudden-head, pudding head, stupe, stupid, stupid person

   A dunce; a dolt; a stupid fellow. [1913 Webster]
"They have talked like numskulls." [1913 Webster]

numskull, n. (also numbskull) a stupid or foolish person.

Etymology:
NUMB + SKULL

N  ignoramus, dunce, wooden spoon, no scholar, (imbecility) 499 (folly) 501 moron, imbecile, idiot, fool, jerk, nincompoop, asshole, dilettante, sciolist, smatterer, dabbler, half scholar, charlatan, wiseacre, greenhorn, amateur, novice, tyro, numskull, lubber, fool, pedant, bookless, shallow, ignorant, a wit with dunces and a dunce with wits.