Then aside to Marilla in an audible whisper, "There wasn’t anything startling in that, was there, Marilla?"
The stout lady occasionally turned her head squarely around and surveyed Anne through her eyeglasses until Anne, acutely sensitive of being so scrutinized, felt that she must scream aloud; and the white-lace girl kept talking audibly to her next neighbor about the "country bumpkins" and "rustic belles" in the audience, languidly anticipating "such fun" from the displays of local talent on the program.
There are no more uses of "audible" in the book.
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She spoke in a barely audible whisper.
It was so quiet, our breathing was the only thing audible in the room.