Just as Shasta was saying to himself, "We must be nearly at those sandhills by now," his heart leaped into his mouth because an appalling noise had suddenly risen up out of the darkness ahead; a long snarling roar, melancholy and utterly savage.
There was a frightful confusion’; and an appalling noise.
There are no more uses of "appalling" in the book.
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The live in appalling conditions.
She has scheduled a news conference to respond to the appalling accusations.