noun
unreported; not officially registered; failing to report
Used for something that should have been reported or registered to an authority but has not been. Often appears in legal, administrative, or formal contexts, such as unregistered marriages, unreported income, or unlicensed businesses.
未届けの婚姻は法的に認められない。
An unregistered marriage is not legally recognized.
未届けの営業は罰則の対象となる。
Unreported business operations are subject to penalties.