heart·break·ing 
/ˈhɑɚtˌbreɪkɪŋ/ adjective
/ˈhɑɚtˌbreɪkɪŋ/ adjective [more heartbreaking; most heartbreaking] : causing great sadness, disappointment, etc.
▪ She wrote a heartbreaking story about the death of her grandfather. ▪ It was heartbreaking to know that there was nothing I could do. ▪ The team suffered another heartbreaking defeat.
▪ She wrote a heartbreaking story about the death of her grandfather. ▪ It was heartbreaking to know that there was nothing I could do. ▪ The team suffered another heartbreaking defeat.
— heart·break·ing·ly adverb [more heartbreakingly; most heartbreakingly]
▪ a heartbreakingly tragic movie
▪ a heartbreakingly tragic movie
