dogmatic
adjective
UK/dɒɡˈmæt.ɪk/
US/dɑːɡˈmæt̬.ɪk/
Definitions of dogmatic adjective
Describes someone who is asserting opinions in an arrogant and stubborn manner, with the assumption that they are correct and everyone else is mistaken; also pertains to something that is based on a set of fixed beliefs.
The professor is known for his dogmatic views, never considering other possibilities.
Despite a lot of evidence to the contrary, he stuck to his dogmatic theory.
Her dogmatic attitude made it difficult for her to collaborate with colleagues.