causing great horror; horribly repugnant; grisly: the site of a gruesome murder.
full of or causing problems; distressing: a gruesome day at the office.
Also, grewsome.

1560–70; obsolete grue to shudder (cognate with German grauen, Dutch gruwen) + -some1

gruesomely, adverb
gruesomeness, noun
ungruesome, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
gruesome (ˈɡruːsəm)
inspiring repugnance and horror; ghastly
[C16: originally Northern English and Scottish; see grue, -some1]

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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Word Origin & History

1570, from M.E. gruen "feel horror, shudder" (c.1300), possibly from M.Du. gruwen or M.L.G. gruwen "shudder with fear" (cf. Ger. grausam "cruel"), or from a Scand. source (cf. Dan. grusom "cruel," grue "to dread," though others hold that these are Low Ger. loan-words). One of the many Scottish words
popularized in England by Scott's novels.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The injury was one of the most gruesome in recent memory.
It is a gripping story from beginning to gruesome end, filled with drama,
  intrigue and love affairs.
That gory swamp is a gruesome grove.
Yet in between gruesome scenes lie passages of calm, reflective beauty: Wrath
  and love burn only like the campfires.
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