inaudibly

She whispered inaudibly to her friend during the meeting.

The actor's lines were delivered inaudibly, causing confusion among the audience.

He mumbled inaudibly while reading the book.

The recording captured the sound of leaves rustling inaudibly in the background.

Her instructions were given inaudibly, so some students missed them.

The wind howled inaudibly outside the cabin.

The old man's words were spoken inaudibly, making it hard to understand him.

The music played inaudibly in the background of the movie scene.

She tried to laugh inaudibly so as not to disturb the others in the library.

The sound of the clock ticking was almost inaudibly in the quiet room.