also: エゴイスチック
na-adjective
Describes a person or attitude that prioritizes oneself over others; often carries a negative connotation.
彼のエゴイスティックな態度にはうんざりだ。
I'm fed up with his egoistic attitude.
エゴイスティックな考え方を改めるべきだ。
You should change your self-centered way of thinking.