ˌself-ˈrighteous BrE AmE adjective
proudly sure that your beliefs, attitudes, and ↑ moral s are good and right, in a way that annoys other people – used to show disapproval SYN sanctimonious :
She’s a vegetarian, but she’s not at all self-righteous about it.
—self-righteously adverb
—self-righteousness noun [uncountable]