Righteous (adjective)

1. morally good; adhering to moral principles; morally correct.
2. self-righteous; characterized by a sense of self-satisfaction from one's own moral superiority.

Origin:

Middle english rightwis, from old english rihtwise, from riht "right" + -wise "-wise".

Examples:

1. The righteous person always does the right thing.
2. His righteous anger was directed at the injustice.
3. She always tries to live a righteous life.
4. He felt righteous about his decision.
5. The righteous person felt no need to defend their actions.