…and Mr. Crawford, and Mr. Yates, with an urgency which differed from his but in being more gentle or more ceremonious, and which altogether was quite overpowering to Fanny; and before she could breathe after it, Mrs. Norris completed the whole by thus addressing her in a whisper at once angry and audible—"What a piece of work here is about nothing: I am quite ashamed of you, Fanny, to make such a difficulty of obliging your cousins in a trifle of this sort—so kind as they are to you!
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.