...the others were being so insistent, and he was curious to learn what they would say when they caught sight of him. If they were shocked then it would no longer be Gregor’s responsibility and he could rest.
These earnest gentlemen — all three of them had full beards, as Gregor learned peering through the crack in the door one day — were painfully insistent on things’ being tidy.
There are no more uses of "insistent" in the book.
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We questioned her repeatedly and she remained insistent that she knew nothing of the event.