自じ己こ中ちゅう心しん的てき

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Meanings

Describes a person or behavior that prioritizes oneself over others, often with a negative connotation. Used as a な-adjective.

利り己こ
利己 describes the pursuit of one's own gain, while 自己中心的 describes an egocentric personality that disregards others' viewpoints.
自じ分ぶん勝かっ手て
自己中心的 stresses seeing everything from one's own viewpoint (egocentric), whereas 自分勝手 focuses on acting selfishly in behavior toward others.
ミーイズム
自己中心的 is a general Japanese adjective meaning 'self-centered', while ミーイズム specifically refers to the social concept of 'me-ism' as a trend or philosophy.

利り己こ主しゅ義ぎN1
利己主義 names a principle or ideology of putting one's own interests first, while 自己中心的 is an adjective describing a self-centered personality or behavior, not a belief system.

Compound of 自己 (self), 中心 (center), and the adjectival suffix 的 (-like). The meaning is transparent from its parts.