Adamant; assertive (8)

I believe the answer is:

dogmatic

(Other definitions for dogmatic that I've seen before include "I'd tog Mac out to be overbearing" , "Stating opinions forcefully and arrogantly" , "Stating opinions as if unquestionable" , "Opinionated" , "Giving opinions in arrogant know-all way" .)

I've seen this clue in the Sydney Morning Herald.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.