Self-righteous; describing an attitude of convinced moral or intellectual superiority and unwillingness to accept others' views.
彼はいつも独善的な態度で、周りの人をイライラさせる。
He always acts self-righteously and annoys people around him.
政治家の独善的な決定が市民の反発を招いた。
The politician's self-righteous decisions provoked public backlash.
反省せずに独善的に振る舞うのは問題だ。
It's a problem to behave self-righteously without reflection.