1.
missing person; person whose whereabouts are unknown
A person whose whereabouts have become unknown — used in news reports about disasters, accidents, runaways, and police searches.
行方不明者が出た。
There were people who went missing.
行方不明者の捜索が続いている。
The search for the missing person continues.
地震による死者は二十名、行方不明者は十名に達した。
The earthquake's death toll reached 20, with 10 people still missing.
Compound of 行方 (whereabouts) + 不明 (unknown) + 者 (person). Standard news-and-officialese term, especially in reporting on natural disasters, accidents, and police investigations.
COMMON COLLOCATIONS:
- 行方不明者の捜索: search for missing people
- 行方不明者届: missing person report (filed with police)
- 行方不明者が出る: for someone to go missing
- 行方不明者の家族: family of a missing person
SIMILAR WORDS:
- 行方不明: missing; whereabouts unknown — the adjectival/state-of-being form (e.g. 行方不明になる, to go missing)
- 失踪者: missing person; runaway — emphasizes that the person disappeared deliberately, often used in legal contexts