causing intense anguish or sorrow.

1600–10; heartbreak + -ing2

heartbreakingly, adverb

hardy, heartbreaking, hearty.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
heartbreaking (ˈhɑːtˌbreɪkɪŋ)
extremely sad, disappointing, or pitiful

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
And the blight moved with heartbreaking speed-carried by the wind, animals,
  insects and humans.
The commitment of these people is impressive-and, at times, heartbreaking.
But the heartbreaking efforts of this disparate team live on in their splendid
  little gray engine.
Others merely looked upon her with heartbreaking hopelessness.
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