不同意|ふどういfudoui

1. noundisagreement; disapproval; objection; dissent; non-consent

• Synonym異存いぞんWrittenAn objection; most often in the negative 「異存はない」, meaning there is none.
• Synonym難色なんしょくWrittenAn attitude of reluctance or hesitation; typically in 「難色を示す」.
• Synonym不賛成ふさんせいNeutralNearly synonymous with 「不同意」; slightly more colloquial and used less often.
• Synonym不承知ふしょうちWrittenRefusing another person's request, with a feeling of reluctance; a written word rarely used today.
• Synonym不承諾ふしょうだくWrittenNot accepting another's request or proposal; written in tone and rarely used.
• Synonym不認可ふにんかFormalFormal: an authority declines to approve; confined to administrative licensing-type approvals.
• Related食い違いくいちがいNeutralAccounts or opinions that don't line up; an objective divergence, with no implication that the speaker opposes.
• Related相違そういWrittenA difference between two things; often seen in 「相違ない」; carries no sense of opposition.
• Related対立たいりつNeutralTwo sides with opposing positions, neither yielding; an ongoing standoff rather than a single statement of dissent.
• Related不満ふまんNeutralDissatisfaction with the current state of things; not necessarily aimed at a particular proposal.
• Related非難ひなんNeutralBlaming or censuring another's faults; much stronger in tone than simple disagreement.
• Related異議いぎNeutralAn opposing opinion, whether or not formally raised, as in 「異議がある」 or 「異議あり」.
• Related不服ふふくNeutralDissatisfaction with how a matter was handled; commonly in 「不服申し立て」.
• Related争議そうぎWrittenA dispute between opposing parties such as labor and management, as in 「労働争議」.
• Related不承認ふしょうにんFormalFormal: not approving or recognizing — covers a failed approval, and also refusal to recognize a status, fact, or claim.
• Related不承ふしょうWrittenNot consenting, or consenting only reluctantly; mostly in the adverbial 「不承不承」.
• Related不許可ふきょかFormalFormal: permission withheld; used in approval contexts such as applications and entry into the country.
• Related不一致ふいっちNeutralNot being in accord; used for data, opinions, or actions that fail to match — an objective description.
• Antonym同意どういNeutralAgreeing with another's opinion or granting a request; the direct opposite of 「不同意」.
• Antonym賛成さんせいNeutralExpressing support for an opinion or proposal; common in everyday talk and in voting; opposite of 「不同意」.

To voice disagreement, 「反対」 is the usual everyday word, while 「不同意」 itself leans formal. Raise an objection at a meeting with 「異議」; show reluctance with 「難色を示す」; and when an approval falls through, use 「不承認」 or 「不許可」.

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

1. 意見いけんや考え方かんがえかたが異ことなること。また、提案ていあんや意見いけんに対たいして反対はんたいすること。