Definitions

1. noun

a foolish or obstinate person; a stubborn or obstinate person, especially one who resists change or refuses to listen to advice

“The knothead refused to change his opinion, even when presented with overwhelming evidence to the contrary.”

2. noun

a person who is considered foolish or obstinate, especially in a specific context or situation

“The coach was at his wit’s end trying to deal with the knothead on his team who refused to listen to instructions.”