egomaniac /ˌiːɡəʊˈmeɪnɪæk, ˌɛg-/

• 1. 

  N-COUNT An egomaniac is someone who thinks only of themselves and does not care if they harm other people in order to get what they want. 利己主义者 [表不满]

  例：

  Arnie is clever enough, but he's also an egomaniac.

  阿尼很聪明，但他又是一个利己主义者。