Never was a Family more insistent on learning one another’s movements than were the Bunch.
His car was banked with four others in a line of steel restless as cavalry, while the cross town traffic, limousines and enormous moving-vans and insistent motor-cycles, poured by; on the farther corner, pneumatic riveters rang on the sun-plated skeleton of a new building; and out of this tornado flashed the inspiration of a familiar face, and a fellow Booster shouted, "H’ are you, George!"
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.