noun
dissent; disagreement; disapproval; objection; refusal
Formal noun expressing non-acceptance, objection, or refusal. Often used in official, legal, or business contexts.
委員会はその提案に不承諾の意を示した。
The committee expressed its disapproval of the proposal.
We received a notice of refusal from the other party regarding the contract changes.
承諾 means consent or acceptance; 不承諾 is its direct antonym, meaning non-consent or refusal.
Compound of 不 (non-) and 承諾 (consent, acceptance).