無私|むしmushi[1]atamadaka (head-high)

1. no-adjective, na-adjectiveunselfish; selfless; disinterested

• Synonym滅私めっしNeutralMeans casting off selfishness, usually in 「滅私奉公」; it stresses sacrificing oneself for a public cause.
• Synonym無欲むよくNeutralMeans having no greed or desires, as in 「無欲の勝利」; it stresses freedom from avarice and does not necessarily imply fairness.
• Synonym無私無欲むしむよくNeutralA four-character compound covering both selfishness and greed; it stresses freedom from desire more strongly than 「無私」 does.
• Related公明正大こうめいせいだいNeutralA four-character word for fair, upright, aboveboard conduct; it stresses handling matters fairly and transparently.
• Related虚心きょしんNeutralRefers to an open, receptive mind free of preconceptions, as in 「虚心坦懐」; it is about one's attitude, not about avoiding selfish gain.
• Related公正こうせいNeutralMeans fair and just; it stresses sound, reasonable judgment and handling of matters, and does not necessarily involve the absence of selfish motives.
• Related公平こうへいNeutralMeans dealing with everyone impartially; it stresses treating all alike and is the everyday word for fair.
• Related中正ちゅうせいWrittenWritten and very rare; it means staying impartial without leaning to either side, stressing a centered stance rather than the absence of selfish motives.
• Related至公しこうWrittenWritten and very rare; it means utmost fairness. In most cases 「公正」 or 「公平無私」 is the natural choice.
• Related愛他主義あいたしゅぎWrittenA written-style word for altruism, meaning the same as 「利他主義」 but used less often.
• Related利他りたNeutralMeans putting others' interests first, as in 「利他の精神」; the focus is on benefiting others rather than on lacking selfish motives.
• Related利他主義りたしゅぎNeutralA doctrine that puts others' welfare first; it is mainly an ethics term rather than a word for everyday character.
• Antonym利己りこNeutralThe antonym: seeking only one's own benefit, as in 「利己主義」; it stands in direct contrast to 「無私」.

For everyday talk about fairness, 「公平」 and 「公正」 are the usual words. 「無私」 itself leans toward written prose, alongside 「公平無私」, when you mean acting without private motives. Use 「滅私奉公」 for sacrificing yourself for a public cause and 「利己的」 for looking only after your own interests.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 個人的こじんてきな利益りえきを考かんがえないこと。私心ししんがないこと。また、そのさま。