heartbreaking
1. [ adjective ] causing or marked by grief or anguish
Synonyms: heartrending grievous
Examples:

"a grievous loss" "a grievous cry" "her sigh was heartbreaking" "the heartrending words of Rabin's granddaughter"

Related terms: sorrowful
Similar spelling:   heartbreak
  heartburning
  heartbroken
  heretofore