Unrequited suggests deep emotions that aren't returned, often leading to sadness or longing. She sang a song about her unrequited passion.
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Not Just Romantic
'Unrequited' can apply to any situation where feelings or efforts are not reciprocated, not solely love. His unrequited efforts to be friendly were met with cold indifference.
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Narrative Use
In literature or movies, unrequited often signals tragic or unfulfilled characters or themes. The novel's hero was driven by unrequited desire.