egoistic; self-centered; selfish
その自己中心的な意見は通らない。
That self-centered opinion won't be accepted.
幼い子供は自己中心的に物事を捉えがちだ。
Young children tend to perceive things in a self-centered way.
君のその突然の決断は、少し自己中心的で周りが見えていないよ。
Your sudden decision is a bit self-centered and doesn't consider those around you.