Meaning of the word knucklehead in English

What does knucklehead mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

knucklehead

US /ˈnʌk.əl.hed/
UK /ˈnʌk.əl.hed/

Noun

a foolish or stupid person

Example:
Don't be such a knucklehead and pay attention!
My little brother can be a real knucklehead sometimes.