egomania

/ˌiːɡoʊˈmeɪniə/
noun
  1. An excessive and obsessive preoccupation with oneself, one's own needs, desires, or importance; extreme selfishness or self-centeredness.
    • His egomania made it impossible for him to work as part of a team.
    • Living with someone who has egomania can be exhausting for family and friends.
    • The politician's egomania led him to believe he was the only one who could save the country.
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