self-righteous
Self-righteous (adjective) means Convinced of your own moral superiority, and making it plain in a way others find insufferable. Example: “He delivered a self-righteous lecture about recycling and then flew to Ibiza.”
How to use self-righteous
Learner’s notesIn plain EnglishSure you are morally better than everyone else, and showing it.
Neutral in register but always critical in force.
Fill the gap
Can you complete this real example?
He delivered a _____ lecture about recycling and then flew to Ibiza.
Etymology
A compound of self and righteous, meaning righteous in one's own estimation.