Self-righteous (adjective)

1. Having or characterized by a strong and arrogant belief in one's own righteousness.
2. Having a strong belief that one's own views and actions are morally superior to those of others.

Origin:

Composed of the word "self" meaning "oneself" and "righteous" meaning " morally right or justifiable".

Examples:

1. He was self-righteous and unwilling to consider alternative perspectives.
2. Her self-righteous attitude made it difficult for her to work with others.
3. His self-righteousness blinded him to the faults in his own argument.
4. The self-righteous politician was unwilling to compromise on any of his positions.
5. The self-righteousness of the religious leader made it difficult for him to connect with his congregation.