expression
author unknown; anonymous
Used in classical Japanese poetry collections (e.g., Kokinshū) to indicate that the composer of a poem is unknown. The phrase itself is a set expression, not a productive grammatical pattern.
古今和歌集には「詠み人知らず」の歌が多く収められている。
The Kokin Wakashū contains many poems marked 'author unknown'.
この句は詠み人知らずとされている。
This verse is considered to be by an unknown poet.