同じる|どうじるdoujiru

1. ichidan verb, intransitive verbto agree

• Synonym同意どういNeutralThe most general word for agreeing, as in 「契約に同意する」; 「同じる」 is a literary, old-fashioned way to say it.
• Synonym賛同さんどうNeutralAgreeing with another person's opinion, with a nuance of active support, as in 「趣旨に賛同」.
• Synonym賛するさんするWrittenWritten, literary word for approving or assenting; can also mean inscribing a eulogy on a painting. Rarely used.
• Synonym同ずるどうずるWrittenA written alternative form of 「同じる」 with the same meaning; equally rare in modern use.
• Synonym首肯しゅこうWrittenWritten term for nodding assent, as in 「首肯しかねる」; leans toward signalling one's stance.
• Related是認ぜにんFormalFormal: judging something right and approving it, as in 「現状を是認する」.
• Related賛成さんせいNeutralThe everyday word for being in favour, most common in speech, as in 「賛成多数」.
• Related了解りょうかいNeutralUnderstanding and accepting something; also used as 「了解です」 to acknowledge a message.
• Related承服しょうふくWrittenWritten word for accepting out of genuine conviction; very often negated, as in 「承服できない」.
• RelatedＯＫオッケーCasualColloquial and casual for yes or fine. For formal agreement prefer 「承知」 or 「同意」.
• Related承認しょうにんNeutralFormal recognition or approval, as in 「承認を得る」; leans toward official procedure.
• Related認可にんかFormalFormal: approval granted by a competent authority, as in 「認可保育園」.
• Related容認ようにんWrittenWritten word for tolerating or accepting something, as in 「容認できない」.
• Related諒するりょうするFormalFormal and old-fashioned: to understand and accept someone's feelings or circumstances. Very rare.
• Related裁可さいかFormalFormal term for a monarch's sanction; historical and constitutional in flavour.
• Related裁許さいきょFormalFormal, old-fashioned word for a superior approving a subordinate's actions or decisions.
• Related聞き届けるききとどけるWrittenWritten: to hear a request out and grant it; implies a superior acting toward a subordinate.
• Related聞き入れるききいれるNeutralTo heed and grant a request, as in 「願いを聞き入れる」.
• Related承引しょういんWrittenWritten word for consenting to take something on; very rare.
• Related然諾ぜんだくFormalFormal word for readily saying yes; mostly in set phrases like 「然諾を重んじる」.
• Related聴許ちょうきょFormalFormal word for granting a requested permission; very rare.
• Antonym反対するNeutralTo oppose or object; the direct antonym of 「同じる」.
• Antonym異議を唱えるWrittenWritten expression for raising an objection; the opposite of agreeing.

In everyday speech, 「賛成」 and 「同意」 are the natural choices; 「同じる」 and 「同ずる」 are literary, surviving mainly in written phrases like 「〜に同ずる」. For official or procedural approval use 「承認」 (「認可」 for an authority's licence), and to oppose, 「反対する」. Others are narrower: 「賛同」 for backing an idea, 「了解」 for acknowledging, 「容認」 for tolerating, 「聞き入れる」 for granting a request. 「賛する」「是認」「首肯」「承服」「諒する」「裁可」「裁許」「承引」「然諾」「聴許」 are formal or literary and rare in modern use.

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

1. 同意どういする。