Both Uses

yield
in
The One, by Kiera Cass
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We were supposed to place the branches at the foot of the king as a sign of peace toward our leader and our willingness to yield to the law.
p. 167.2 *

yield = give in, give way, or give up
The king's face was unyielding.†
p. 205.7

unyielding = strict, firm, or hard (not giving in, not giving way, or not giving up)

standard prefix: The prefix "un-" in unyielding means not and reverses the meaning of yielding. This is the same pattern you see in words like unhappy, unknown, and unlucky.

Definitions:

(1) (yield as in: will yield valuable data)
to produce (usually something wanted); or the thing or amount produced
(2) (yield as in: yield to pressure)
to give in, give way, or give up
(3) (meaning too rare to warrant focus)