love·sick
adjective/ˈlʌvsɪk/
/ˈlʌvsɪk/
- unable to think clearly or behave in a sensible way because you are in love with somebody, especially somebody who is not in love with you
害相思病的（尤指单相思的） - He’s been wandering around all week like a lovesick teenager.
他整个星期都在四处游荡，就像一个患相思病的少年一样。
Oxford Collocations DictionaryLovesick is used with these nouns:- teenager
- He’s been wandering around all week like a lovesick teenager.