WordWeb Online

1. Befitting or characteristic of those who incline to social exclusiveness and who rebuff the advances of people considered inferior
   "Neither will it do to call everything that is extravagant, elitist, highbrow, or a minority taste snobbish";
   - clannish, cliquish, clubby [informal], snobby [informal]
    
2. (used colloquially) overly conceited or arrogant
   - bigheaded, persnickety, snooty [informal], snot-nosed [informal], snotty [informal], stuck-up [informal], too big for one's breeches [informal], uppish [informal]

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

Encyclopedia: Snobbish