利り己こ主しゅ義ぎ者しゃ

noun

egoist

A person who acts based on self-interest, often at the expense of others. Can be used in both critical and descriptive contexts.

• 彼かれは自じ分ぶんのことしか考かんがえない利り己こ主しゅ義ぎ者しゃだ。

  He is an egoist who only thinks about himself.

• 利り己こ主しゅ義ぎ者しゃと利り他た主しゅ義ぎ者しゃの違ちがいについて議ぎ論ろんした。

  We discussed the difference between an egoist and an altruist.