His scientific knowledge, and his vigilance and skill in conducting ingenious experiments, brought him otherwise into moderate request, and he earned as much as he wanted.
He devoted himself during the remainder of the evening to keeping a most vigilant watch on Mrs. Cruncher, and sullenly holding her in conversation that she might be prevented from meditating any petitions to his disadvantage.
There are no more uses of "vigilant" in the book.
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We need to remain vigilant when interacting with websites we don’t know.