UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈhɑːrtbreɪkɪŋ/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˈhɑrtˌbreɪkɪŋ/ ,USA pronunciation: respelling(härtbrā′king)

WordReference Random House Learner's Dictionary of American English © 2020
heart•break•ing /ˈhɑrtˌbreɪkɪŋ/USA pronunciation  adj. 
  1. causing great sorrow, grief, or anguish:a heartbreaking loss.

WordReference Random House Unabridged Dictionary of American English © 2020
heart•break•ing  (härtbrā′king),USA pronunciation adj. 
  1. causing intense anguish or sorrow.
heartbreak′ing•ly, adv. 
  • heartbreak + -ing2 1600–10

Collins Concise English Dictionary © HarperCollins Publishers::
ˈheartˌbreaking /ˈhɑːtˌbreɪkɪŋ/ adj
  1. extremely sad, disappointing, or pitiful
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