If you believe you are the most talented, charming, intelligent person on Earth then you are egotistic (or a politician): in other words you have too inflated an opinion of yourself.

Egotistic is derived from the Latin word ego for "I." Don't confuse egotistic with egoistic, which is essentially a moral philosophy that believes all human actions, even the most seemingly selfless, are guided at heart by self-interest. It's possible to be egoistic without being egotistic, and vice versa.

Definitions of egotistic
  1. adjective
    characteristic of those having an inflated idea of their own importance
    synonyms: egotistical, narcissistic, self-loving
    concerned chiefly or only with yourself and your advantage to the exclusion of others
  2. adjective
    characteristic of false pride; having an exaggerated sense of self-importance
    synonyms: conceited, egotistical, self-conceited, swollen, swollen-headed, vain
    feeling self-respect or pleasure in something by which you measure your self-worth; or being a reason for pride
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