What is it then called when you could and should have easily verified your belief and even after pointing out that your belief is wrong, you refuse to admit that your belief was actually wrong, if not lying?
"No, sir. I did not lie in my CV. I _believe_ that this funny looking letter I received from my mother some time ago means that I have Ph.D from MIT"
> even after pointing out that your belief is wrong
Some people believe their arguments are so strong that the other person must have been secretly convinced, and is therefore lying.
Setting aside for the moment that people often believe their arguments are far more convincing than they actually are, people can and do believe anything, so a better reason than that is necessary to accuse people of lying.
"No, sir. I did not lie in my CV. I _believe_ that this funny looking letter I received from my mother some time ago means that I have Ph.D from MIT"