They kept a constant watch over her, but in spite of their vigilance she escaped on the very last day, and made her way into Fyodor Pavlovitch’s garden.
He appeared in ragged and dirty clothes, muddy boots, and in spite of the vigilance and expert observation of the police officers, he turned out to be hopelessly drunk.
In the first place that Grigory, who had been intending to take his medicine, might put it off and remain on guard, seeing there was no one to look after the house, and, in the second place, I suppose, that his master seeing that there was no one to guard him, and in terror of a visit from his son, might redouble his vigilance and precaution.
"Listen, you frivolous young woman," Krassotkin began, getting up from the sofa, "can you swear by all you hold sacred in the world and something else besides, that you will watch vigilantly over the kids in my absence?
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.