Other forms: pridefully
Someone who's prideful is arrogant and disdainful. Prideful people don't usually have many friends, since they think they're superior to everyone else.
Although the adjective prideful is occasionally used simply to mean "proud," or pleased and happy because of some achievement or quality, it usually means something closer to "haughty." If you know someone who's beyond proud, believing they're smarter, more beautiful, or just generally better than most other people, you can describe that person as prideful.