WordNet (r) 3.0 (2006):

broken heart
    n 1: devastating sorrow and despair; "he is recovering from a
         broken heart"; "a broken heart languishes here"

Moby Thesaurus II by Grady Ward, 1.0:

30 Moby Thesaurus words for "broken heart":
   aching heart, agony, agony of mind, anguish, bale, bitterness,
   bleeding heart, brokenheartedness, crushing, depression,
   depth of misery, desolation, despair, extremity, grief, heartache,
   heartbreak, heartbrokenness, heartsickness, heartsoreness,
   heavy heart, infelicity, melancholia, melancholy, misery,
   prostration, sadness, suicidal despair, woe, wretchedness