noun
- a stupid or foolish person
Usage: informal
Examples
- Don’t be such a knucklehead and forget your keys again.
- That knucklehead drove the wrong way down a one-way street.
- My brother can be a real knucklehead sometimes.
- The coach called the player a knucklehead for missing practice.
- Stop acting like a knucklehead and pay attention.
- Even smart people can be knuckleheads when they’re not thinking.