the tendency to insist that one's beliefs or opinions are true without examining any other opinions or considering any evidence, especially in a way that is arrogant and often unnecessary;
e.g. I think that his dogmatism is due to his old age and limited experience.
(noun)
an idea, belief, or opinion or (or a system of these) based on inadequate consideration and insufficient evidence;
e.g. She stood by her dogmatism and refused to listen to anything they had to say.