Definition of heartsick adjective from the Oxford Advanced Learner's Dictionary

 

heartsick

 adjective
adjective
BrE BrE//ˈhɑːtsɪk//
 
; NAmE NAmE//ˈhɑːrtsɪk//
 
[not usually before noun](literary) Unhappiness, Disappointment
 
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extremely unhappy or disappointed See related entries: Unhappiness, Disappointment
See the Oxford Advanced American Dictionary entry: heartsick