A stupid person.
More example sentences
- While sitting on the side of the road with nothing to do, the two knuckleheads decided to smoke a joint.
- I'm sure the crowd has a proportion of knuckleheads who still could turn nasty.
- We had the knuckleheads, troublemakers, drinkers, the terminally unlucky and the hopeless dreamers.
Definition of knucklehead in:
- The British & World English dictionary