knucklehead
knuck·le·head
noun
1.
these words are used to express a low opinion of someone''s intelligence
Origin
From knuckle + head.
Related words
Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.