Morbid (7)
I believe the answer is:
macabre
'morbid' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for macabre that I've seen before include "Shockingly horrible" , "Morbidly repellent" , "Gruesome, suggesting death" , "Dark and disturbing" , "Ghastly, gruesome" .)