Dogmatic
(adj) Expressed in an authoritative or arrogant manner
Synonyms
1. Arrogant
2. Egotistical
3. Overbearing
4. Narrow-minded
Antonyms
1. Flexible
2. Willing
3. Indecisive
4. Doubtful
Sentences
1. The dogmatic boss acted as though he was smarter and better than everyone else.
2. As soon as she got the job, she started to act in a dogmatic manner, believing she was far more superior than her friends.
My Favorite example of dogmatism