WordWeb Online

1. Having or showing arrogant superiority to and disdain of those one views as unworthy
   "walked with a prideful swagger";
   - disdainful, haughty, imperious, lordly, overbearing, sniffy [informal], supercilious, swaggering, toplofty [US, informal], orgulous [archaic]
    
2. Joyful and proud especially because of triumph or success
   "prideful crowds filled the streets on VJ Day";
   - exultant, exulting, jubilant, rejoicing, triumphal, triumphant

See also: elated, proud

Encyclopedia: Prideful