righteousness

noun

1. The quality or state of being morally sound: good, goodness, morality, probity, rectitude, rightness, uprightness, virtue, virtuousness. See right/wrong.
2. The moral quality of a course of action: ethic (used in plural), ethicality, ethicalness, morality, propriety, rightfulness, rightness. See right/wrong.

The noun has one meaning:

Meaning #1: adhering to moral principles
  Antonym: unrighteousness (meaning #1)