egotism egotism /ˈiːgəˌtɪzəm/

noun

1. () An exaggerated opinion of your own importance  ( self-importance , swelled head [Informal, N. American] , egotism )
   an exaggerated opinion of your own importance
   
2. An inflated feeling of pride in your superiority to others  ( egotism , self-importance , ego )
   an inflated feeling of pride in your superiority to others
     His huge ego prevented him from admitting his mistakes.
   His huge ego prevented him from admitting his mistakes.