All 4 Uses

unrequited
in
Running in the Family
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He would put on "I kiss your little hand, Madame" and mime great passion for an invisible partner, kissing the mythical hand, pleading to the stars and jungle around him to console him in an unrequited abstract love.†
p. 47.1

unrequited = not returned or repaid
There are stories of elopements, unrequited love, family feuds, and exhausting vendettas, which everyone was drawn into, had to be involved with.†
p. 53.9 *
Hundreds of small verses
by different hands
became one
habit of the unrequited.†
p. 93.6
Then when she was sixty-five and drinking at the wedding lunch, and obviously there is a period of unrequited love suffered by the silent Trevor who never stated his love but always fought with anyone he thought was insulting your mother, even if in truth she was simply having a good time with them the way she was with Hilden, when she was sixty-five.†
p. 108.3

Definitions:

(1) (unrequited)
not returned (typically of feelings -- as in unrequited love)
(2) (meaning too rare to warrant focus)
In classic literature as late as the 19th century, both requite and requited are used more than unrequited.

When not referring to returned feelings or other senses of return, requite may indicate a suitable non-cash repayment. To requite a wrong is to perform an act of revenge. To requite a kindness is to return a good deed.