egotistic

adjective

1. Thinking too highly of oneself: conceited, egoistic, egoistical, egotistical, narcissistic, vain, vainglorious. Informal bigheaded, stuck-up, swellheaded. See self-love/modesty.
2. Concerned only with oneself: egocentric, egoistic, egoistical, egomaniacal, egotistical, self-absorbed, self-centered, self-involved, selfish, self-seeking, self-serving. Idioms: wrapped up in oneself. See self/other.

The adjective has 2 meanings:

Meaning #1: characteristic of those having an inflated idea of their own importance
  Synonyms: egotistical, narcissistic, self-loving

Meaning #2: characteristic of false pride; having an exaggerated sense of self-importance
  Synonyms: conceited, egotistical, self-conceited, swollen, swollen-headed, vain