Once or twice, hearing sleigh-bells, Ethan turned his head, fancying that Zeena and Jotham might overtake him; but the old sorrel was not in sight, and he set his face against the rain and urged on his ponderous pair.
There are no more uses of "ponderous" in the book.
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The findings were presented in a ponderous three-volume report.
We’ve been working through the ponderous regulatory approval process for the last two years.