不詳

1. Origins, structure, and basic meaning

• Structure: 不詳 is read as ふしょう and means “unknown” and “unidentified”.
• Basic usage: It describes an old document of unknown authorship and date, and a novel character of unidentified identity.

2. Common pitfalls and similar expressions

• 作者も年代も不詳だ / 身元不詳の人物
  • Use 作者も年代も不詳だ predicatively and 身元不詳の人物 as a compound modifier.