音おともなく

expression, adverb

quietly; soundlessly; without a sound

Describes an action done so quietly that no sound is made. Often used with verbs of movement or appearance.

• 猫ねこが音おともなく部屋へやに入はいってきた。

  The cat came into the room without a sound.

• ドアが音おともなく開ひらいた。

  The door opened silently.