In one of these cells were several globes, or balls, of a most ponderous metal, about the bigness of our heads, and requiring a strong hand to lift them: the other cell contained a heap of certain black grains, but of no great bulk or weight, for we could hold above fifty of them in the palms of our hands.
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.