A self-righteous one is someone who is overly confident in their own moral correctness and judgment. This type of person can be referred to as a PRIG, which is a four letter word, or a PHARISEE, which is an eight letter word. A PRIG is someone who is excessively concerned with propriety and correctness, while a PHARISEE is someone who is excessively devoted to the letter of the law and rigidly adheres to traditional beliefs.