気付かれずに

without being noticed

→ 気付く
phrase Rare #40,781
without being noticed Used when someone does something without another person noticing. 気付かれずに is the negative ずに form of 気付かれる, meaning “to be noticed.”
JA: 彼は誰にも気付かれずに家を出た。
EN: He left the house without anyone noticing.

彼のふしだら行為は気付かれずにすまなかった

His indecent behavior did not go unnoticed.

私に気付かれずに彼はそれをやった

He did it without me noticing.

ジドラー気付かれずに潜入成功

Successfully infiltrated without being noticed by Zidler.

— ムーラン・ルージュ (2001)

ホームズ誰にも気付かれずに部屋から出ていった

Holmes left the room without anyone noticing.