sanctimonious

Showing that you think you are morally better than other people, in a way that annoys them.

This strongly disapproving word suggests that someone is displaying their supposed goodness or high standards in a smug, judgmental way. It does not necessarily mean that the person is insincere.

• His sanctimonious lecture about being on time annoyed everyone.
• She sounded sanctimonious when she criticized my messy desk.
• I don't want to seem sanctimonious, but perhaps we should clean up after ourselves.