Adjective

(en adjective)

Unanswered; not returned; not reciprocated; not repaid.

* 1820 , , The Monastery , ch. 20,

I stand on the privilege of a free Scotchman, and will brook no insult unreturned, and no injury unrequited .

* 1872 , , Roughing It , ch. 61,

One of my comrades there—another of those victims of eighteen years of unrequited toil and blighted hopes—was one of the gentlest spirits that ever bore its patient cross in a weary exile.

* 1912 , , Miss Billy's Decision , ch. 27,

To her mind, a girl who would tell of the unrequited love of a man for herself, was unspeakably base.

Adjective

(-)

(of a task) not appreciated or rewarded

* {{quote-news, year=2014

, date=November 14 , author=Stephen Halliday , title=Scotland 1-0 Republic of Ireland: Maloney the hero , work=The Scotsman citation , page= , passage=In a raucous atmosphere, it was an unforgiving and physical contest from the start. Grant Hanley conceded the first free-kick within the opening 20 seconds, setting the tone for a busy and thankless evening for Serbian referee Milorad Mazic.}}

(of a person) ungrateful or unappreciative