Example setting: You are discussing a certain topic/problem with a math professor who is good at that certain topic/field. On this occasion he is wrong but cannot see the point because he is too confident of himself. My choice is overconfident; is there a better single word?
Learn English – Word for “so confident that cannot see the truth”
single-word-requests
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Best Answer
This might possibly have negative connotation where you don't mean to imply such, but the word that comes to mind is obstinate.
From Merriam-Webster
I might even say "He was confidently obstinate" to clarify the source of the obstinance, but I believe over-confidence is the default assumption in these cases.