알려지지 않았어

is unknown

→ 알려지다

phrase Rare #25,788

is unknown Informal spoken form meaning that something is not known or has not been revealed. Often translated as “remains unknown” when 아직 is included or implied.

KO: 그 사람의 행방은 아직 알려지지 않았어.

EN: That person's whereabouts are still unknown.

화재 의 원인은 아직 알려지지 않았어.

The cause of the fire is not yet known.

나머지 한 명은 알려지지 않았어

The identity of the remaining person is unknown.

— 후 엠 아이 (2014)

화재 의 원인은 알려지지 않았어.

The cause of the fire is unknown.

사고 의 원인은 알려지지 않았어.

The cause of the accident is unknown.