noun
Formal term for official disapproval or rejection, often used in administrative, legal, or institutional contexts.
申請は不認可となった。
The application was rejected.
計画は当局の不認可を受けた。
The plan received disapproval from the authorities.
却下 is a more common term for rejection, especially of a motion or application, while 不認可 is more formal and often implies a higher authority's disapproval.
Compound of 不 (fu, 'not') and 認可 (ninka, 'approval'), forming a formal noun meaning 'disapproval' or 'rejection'.