危き険けん人じん物ぶつ

noun

dangerous person; security risk

A person who poses a physical, criminal, or security threat. Often used in law enforcement, security, or warning contexts.

• 彼かれは警けい察さつから危き険けん人じん物ぶつとみなされている。

  He is regarded as a dangerous person by the police.

• 空くう港こうで危き険けん人じん物ぶつリストに載のっている人じん物ぶつが拘こう束そくされた。

  A person on the security risk list was detained at the airport.

noun

loose cannon

An unpredictable or uncontrollable person whose behavior could cause trouble, especially in an organization or team.

• あの新しん人じんは何なにをしでかすかわからない危き険けん人じん物ぶつだ。

  That new guy is a loose cannon; you never know what he'll do.