All 3 Uses

insistent
in
The Mysterious Benedict Society
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Between classes they hurried through the corridors, not wanting to be ambushed by Martina, and when at lunchtime they spotted Martina lingering near the cafeteria counter, they put off getting their lunches despite the insistent growling in their bellies.†
p. 195.5

insistent = persistent or continuing or firm
The horn still sounded from across the water, insistently repeating its urgent message.†
p. 429.5 *

insistently = in a persistent or firm manner
Let us begin, the Whisperer repeated, more insistently.†
p. 443.1

Definitions:

(1) (insistent)
persistent or continuing or firm -- especially in maintaining a view or demanding something
(2) (meaning too rare to warrant focus)