The boy caught her puzzled glance, grinned and, as if to help her, whistled softly, almost inaudibly the first notes of Halley’s Fifth Concerto.
"I beg your pardon," he said, his voice barely audible, "I didn’t hear what you said."
"What was the name of the factory?" she asked, her voice barely audible.
…. The sound ray is invisible, inaudible and fully controllable in respect to target, direction and range.
When Francisco raised his head, Rearden saw a face drawn by so great a suffering that its lines were almost an audible cry of pain, the more terrible because the face had a look of firmness, as if the decision had been made and this was the price of it.
"I’ll find them some day, whoever they were …." said Francisco; the tone of his voice, flat, dead and barely audible, said the rest.
"Hello, Dr. Akston," he said; the quiet, low tone of his voice was the audible image of a smile transmitted through space.
Mr. Thompson glanced at James Taggart, at the sloppy posture of a tall figure slumped in ungainly self-distortion, and caught him watching Galt’s movements with such hatred that Mr. Thompson sat up, fearing it would become audible in the room.
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.