知られず

without being known, without anyone finding out

→ 知る
知られ potential stem + ず Negative
verb Rare #43,454
without being known, without anyone finding out A negative form of the passive; often followed by に.
JA: その秘密は誰にも知られずに済んだ。
EN: The secret stayed hidden from everyone.
Conjugation of 知る

わたしたちはどうにか彼女に知られずそれを元に戻した。

We somehow managed to put it back without her noticing.

誰にも知られずに

Without anyone knowing.

— かぐや姫の物語 (2013)

あなたほどの才能の持ち主が世間に知られずにいるのは惜しいことです。

It’s a shame that someone as talented as you remains unknown to the world.

私達はどうにか彼女に知られずにそれを元に戻した。

We somehow managed to put it back without her knowing.