say it: HAHRT-bray-king
heartbreaking is an adjective meaning "causing or marked by grief or anguish". It carries one recorded sense.
causing or marked by grief or anguish
“a grievous loss”
“a grievous cry”
“her sigh was heartbreaking”
“the heartrending words of Rabin's granddaughter”
Definitions, synonyms and semantic relations for heartbreaking come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.