賛成しかねます

cannot agree

→ 賛成
phrase Rare #41,204
cannot agree A polite, formal way to express disagreement or reluctance to support something. The pattern ~しかねる means “be unable or unwilling to ~.”
JA: その計画には賛成しかねます。
EN: I cannot agree with that plan.

どうも賛成しかねます

I'm afraid I can't agree.

君の提案公正道理かなったものではないという理由で賛成しかねます

I can't agree with your proposal because it is neither fair nor reasonable.

私は若い女性ひとりでそこへ行くことに賛成しかねます

I can’t approve of a young woman going there alone.

あなたには賛成しかねます

I'm afraid I can't agree with you.