← BackshareGuessnumbskull/ˈnʌmˌskʌl/nounA stupid or foolish person.Don't be such a numbskull — you need to study for the test.He called himself a numbskull after forgetting his keys for the third time.Only a numbskull would try to fix a leaky pipe without turning off the water.SynonymsdunceblockheadsimpletonAntonymsgenius