To his credit, he then repeated the exercise, calling, "Again, upside down," but because of their insistence on a gravity that didn’t exist, the boys became awkward when the maneuver was under, as if vertigo seized them.
Once he awoke for a few minutes with something pressing his hand, pushing downward on it, with a dull, insistent pain.
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.