英文：unrequited love (n.)
說明：亦可用 one-sided love 來表示。unrequited 這個形容詞意為「單相思的」。
例句：
- John has unrequited love for a girl in his class. (約翰單戀他班上一個女孩)
- Henry has been tortured by his unrequited love for that married colleague. (亨利一直為他單戀那位已婚同事所苦)
- I love him, but he loves her. One-sided love sure sucks. (我愛他，但他卻愛她。單戀真是遜斃了)