同意|どういdoui[0]heiban (flat)

1. noun, suru verb, intransitive verbagreement; consent; approval; assent
   ボブはその計画けいかくに同意どういしなかった。↗

   Bob did not agree to the plan.
2. no-adjectivesame opinion; same view
3. no-adjectivesame meaning

• Synonym賛成さんせいNeutralNoun for approving of an opinion; the emphasis is on voicing support. 「同意」 is about agreeing to a proposal or request.
• Synonym賛同さんどうWrittenWritten-style noun for backing another person's idea or initiative, as in 「趣旨に賛同」.
• Synonym承認しょうにんWrittenWritten-style noun for recognizing something as valid or approving an application — by people, groups or officials, e.g. 「承認を得る」. 「同意」 stresses agreeing with someone.
• Synonym合意ごういWrittenWritten-style noun for two parties reaching agreement, as in 「合意に達する」. 「同意」 can be a one-sided nod of approval.
• Synonym了承りょうしょうWrittenWritten-style noun for acknowledging and accepting something; 「ご了承ください」 is business-polite phrasing.
• Synonym承諾しょうだくWrittenWritten-style noun for granting someone's request or demand, as in 「承諾書」; the stress is on accepting it.
• Synonym許諾きょだくWrittenWritten-style noun for permitting someone to do something at their request, as in 「使用を許諾する」; found in legal writing. 「同意」 is agreeing with an idea or proposal.
• Synonym応諾おうだくWrittenWritten-style noun for granting an application or request; fairly rare and close to 「承諾」.
• Synonym是認ぜにんWrittenWritten-style noun for deeming an action or state of affairs justified, as in 「現状を是認する」. 「同意」 is approving a proposal.
• SynonymコンセンサスNeutralLoanword for a consensus reached by all parties, as in 「コンセンサスを得る」. 「同意」 can be one person's agreement.
• SynonymＯＫオッケーCasualColloquial loanword for OK or fine; mostly spoken and everyday. Formal documents prefer 「承認」 or 「同意」.
• Synonym受け入れるうけいれるNeutralVerb for accepting or taking something in, as in 「提案を受け入れる」; the stress is on accommodating it.
• Synonym同じるどうじるWrittenWritten-style verb for agreeing or echoing; rare today — say 「同意する」 in daily speech.
• Synonym納得なっとくNeutralNoun for being convinced and accepting; the stress is on something clicking mentally. 「同意」 need not imply you are convinced.
• Synonym承服しょうふくWrittenWritten-style noun for submitting to and accepting something, mostly in the negative 「承服しかねる」.
• Related了解りょうかいNeutralUnderstanding and accepting something; also a quick reply, 「了解」, common in speech.
• Related許すゆるすNeutralVerb meaning to permit or forgive; the stress is on allowing someone to do something. 「同意」 carries no sense of forgiveness.
• Related合点がてんNeutralNoun for grasping and accepting something, often in 「合点がいく」. 「同意」 is voicing approval of a proposal.
• Related許可きょかNeutralNoun for permission or authorization; the stress is on allowing an action. 「同意」 stresses agreeing with someone's view.
• Related一致いっちNeutralNoun for opinions matching or corresponding, as in 「意見の一致」; the stress is on alignment itself.
• Related認可にんかWrittenWritten-style noun for official (government) approval, as in 「設立認可」; the stress is on vetting and authorizing.
• Related容認ようにんWrittenWritten-style noun for tolerating or accepting something, often with a shade of reluctant acceptance, as in 「容認できない」.
• Related受諾じゅだくWrittenWritten-style noun for accepting a proposal or terms, as in 「ポツダム宣言受諾」.
• Related首肯しゅこうWrittenWritten-style noun for nodding assent, as in 「首肯しかねる」.
• Related諾ううべなうWrittenArchaic verb for assenting, with a classical flavor and rare today; in everyday speech say 「同意する」.
• Antonym反対はんたいNeutralAntonym: opposing, as in 「反対意見」 — the opposite of 「同意」 on whether you back something.
• Antonym不同意ふどういWrittenAntonym: not agreeing or not approving; directly opposite to 「同意」 but rarely used.
• Antonym拒否きょひNeutralAntonym: refusing or vetoing, as in 「拒否権」 — the opposite of 「同意」 on whether to accept a request.

For agreeing to a proposal or request, use 「同意」, as in 「同意を得る」. To voice support for an opinion, use 「賛成」; when two parties reach agreement, 「合意」; to grant a request, 「承諾」; when you are genuinely convinced, 「納得」; to oppose, 「反対」. Most of the rest are written-style terms (「賛同」「承認」「了承」「許諾」「認可」「容認」「受諾」「承服」), while 「了解」 and 「ＯＫ」 are common in speech.

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

1. 賛同さんどう。承諾しょうだく。
2. 同おなじ意味いみであること。
3. 相手あいてと意見いけんが同おなじであることを態度たいどに現あらわす。
4. 賛同さんどうや承諾しょうだくの意思いしを表明ひょうめいする。