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

1.
独善的な, 自説を曲げない, うぬぼれた
having a high opinion of oneself or one's own opinions; conceited or dogmatic
:
•
His self-opinionated remarks often alienated his colleagues.
彼の独善的な発言はしばしば同僚を遠ざけた。
•
She was too self-opinionated to consider other viewpoints.
彼女は独善的すぎて、他の視点を考慮しなかった。