She folded herself in the large chair, and leaned her head against it in fatigued quiescence, while Tantripp went away wondering at this strange contrariness in her young mistress—that just the morning when she had more of a widow’s face than ever, she should have asked for her lighter mourning which she had waived before.
There are no more uses of "quiescent" in the book.
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She is always on the move and busy, but her boyfriend is quiet and quiescent.
Lady Bertram was perfectly quiescent and contented, and had no objections to make.