Every little while some giant tree yielded the fight and fell crashing through the younger growth; and the unflagging thunder-peals came now in ear-splitting explosive bursts, keen and sharp, and unspeakably appalling.
She sank to the ground and burst into such a frenzy of crying that Tom was appalled with the idea that she might die, or lose her reason.
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.