having a mind firmly unreceptive to new ideas or arguments: It's hard to argue with, much less convince, a closed-minded person.

What does it mean to be called close minded?

: not willing to consider different ideas or opinions : having or showing a closed mind He's becoming increasingly closed-minded in his old age.

What causes a person to be close minded?

Closed-minded people are more interested in proving themselves right than in getting the best outcome. They don't ask questions. They want to show you where you're wrong without understanding where you're coming from. They get angry when you ask them to explain something.