1. Overly conceited or arrogant; showing or characterized by a superior, disdainful, or haughty attitude
   "His stuck-up attitude made him unpopular";
   - bigheaded, snooty [informal], snot-nosed [informal], snotty [informal], too big for one's breeches [informal], uppish [informal], pernickety [Brit, informal], snobbish

See also: proud, toffee-nosed [Brit, informal]