This country, gradually softening towards the neighbourhood of Mr. Bounderby’s retreat, there mellowed into a rustic landscape, golden with heath, and snowy with hawthorn in the spring of the year, and tremulous with leaves and their shadows all the summer time.
There are no more uses of "tremulous" in the book.
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She spoke timidly in a tremulous voice.
She tried to sound confident, but her voice was tremulous.