Doing, or according with, that which is right; yielding to all their due; just; equitable; especially, free from wrong, guilt, or sin; holy; as, a righteous man or act; a righteous retribution
If you think that someone behaves or lives in a way that is morally good, you can say that they are righteous. People sometimes use righteous to express their disapproval when they think someone is only behaving in this way so that others will admire or support them. Aren't you afraid of being seen as a righteous crusader? + righteousness right·eous·ness Both sides in the dispute have been adopting a tone of moral righteousness. + righteously right·eous·ly They righteously maintain that they do not practise rationing