noun
or numb·skull ˈnəmˌskəl
Etymology: numb (I) + skull
1. : a dull or stupid person : bonehead , dunce
the moment he sits down at the piano only a numskull wouldn't know he was a genius — Robert Rice
2. : a thick or muddled head
the wooden sound of numskulls being soundly hit — Edith Sitwell
• num·skulled -ld adjective