self-opinionated
US /ˌself.əˈpɪn.jə.neɪ.tɪd/
UK /ˌself.əˈpɪn.jə.neɪ.tɪd/

1.
eigenwijs, zelfingenomen, dogmatisch
having a high opinion of oneself or one's own opinions; conceited or dogmatic
:
•
His self-opinionated remarks often alienated his colleagues.
Zijn eigenwijze opmerkingen vervreemdden vaak zijn collega's.
•
She was too self-opinionated to consider other viewpoints.
Ze was te eigenwijs om andere standpunten te overwegen.