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Use "heartsickness" in a sentence
"That kind of heartsickness is just the reason Best Coast's modus operandi feels real, or more than a mere throwback to old lovelorn damsels in distress singing about their bad boy dream lovers."
"I could think of no way to console him, nor could I ease my own heartsickness."
"Gary sounded as if he was suffering from the same kind of heartsickness that had afflicted her."