noun
safety unknown; whereabouts unknown
Used in news or formal contexts when a person's safety or fate is not yet confirmed, often after a disaster or accident.
地震の後、多くの住民が安否不明となっている。
After the earthquake, many residents are unaccounted for.
安否不明の乗客の家族は、情報を待っている。
Families of the passengers whose safety is unknown are waiting for information.
Compound of 安否 (safety, well-being) and 不明 (unknown, unclear).