The attitude or doctrine of believing one’s own views or actions are always right and refusing to accept others' opinions.
彼の独善主義のせいでチームの雰囲気が悪くなった。
His self-righteousness worsened the team's atmosphere.
独善主義に陥ると、自分の間違いに気づきにくくなる。
If you fall into self-righteousness, it's harder to notice your own mistakes.
批判的な意見を聞かずに行動するのは独善主義の典型だ。
Acting without listening to critical opinions is a typical example of self-righteousness.