Formal term for official disapproval or refusal to approve, often used in legislative or administrative contexts.
The president vetoed the bill.
The committee's proposal was rejected.
否決 means voting down or rejecting a proposal, often used in meetings or assemblies. 不裁可 implies a higher-level authoritative rejection, such as by an executive.
Compound of 不 (negative prefix) and 裁可 (approval, sanction). 裁可 itself is a formal term for official approval, so 不裁可 literally means 'non-approval' or 'disapproval'.