Both Uses

implicit
in
The Circle
(Edited)

They've accumulated enough credibility that their followers trust their recommendations implicitly, and are deeply thankful for the surety in their shopping.
p. 252.2 *

implicitly = without question or doubt
She didn't need to explain herself, or the future of the world, to the Circlers, who implicitly understood her and the planet and the way it had to be and soon would be.
p. 373.3 *

implicitly = inherently (automatically as a result of who they were)

Definitions:

(1) (implicit as in: not explicitly but implicitly)
not stated directly, but understood (or capable of being understood) from something else

Shared information is often divided into two categories: That which is said explicitly (directly in words that leave no room for confusion or doubt) and that which is said implicitly.
(2) (implicit as in: implicit problem with the design)
exists as an inseparable part or characteristic
(3) (implicit as in: I trust her implicitly.)
without question or doubt
(4) (meaning too rare to warrant focus)
Another sense of the form implicitly is "without doubt or reserve" as in, "I trust Sue implicitly".

It is a more strongly stated sense of the more general meanings; e.g., "Sue implies trustworthiness," or "trustworthiness is inherent in Sue."