bonehead
[noun]
Synonyms: dunce, blockhead, clodpate, hammerhead, knucklehead, muttonhead, numskull, thickhead, thickskull, woodenhead

[TahlilGaran] English Synonym Dictionary ▲

bone‧head /ˈbəʊnhed $ ˈboʊn-/ noun [countable]
informal a stupid person

[TahlilGaran] Dictionary of Contemporary English ▲

bonehead
an unusually dense or stupid person
The boy is a bonehead. He never understands what other people are trying to tell him.

[TahlilGaran] English Idioms Dictionary ▲

bonehead
n., slang An unusually dense or stupid person.
John is such a bonehead
■ small wonder he flunks all of his courses.

[TahlilGaran] English Idioms Dictionary ▲