high and mighty
/ˌhaɪ.əndˈmaɪ.ti/
adjective
- Behaving as if you are more important or better than other people; arrogant and superior.
- Ever since she got that promotion, she's been acting all high-and-mighty with her old friends.
- The manager's high-and-mighty tone made the staff feel unappreciated.
- I don't like his high-and-mighty attitude; he talks down to everyone in the room.