Definition of gruesome adjective from the Oxford Advanced Learner's Dictionary

 

gruesome

 adjective
adjective
BrE BrE//ˈɡruːsəm//
 
; NAmE NAmE//ˈɡruːsəm//
 
 
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very unpleasant and filling you with horror, usually because it is connected with death or injury a gruesome murder gruesome pictures of dead bodies (humorous) We spent a week in a gruesome apartment in Miami. Word Origin late 16th cent.: from Scots grue ‘to feel horror, shudder’ (of Scandinavian origin) + -some. Rare before the late 18th cent., the word was popularized by Sir Walter Scott.
See the Oxford Advanced American Dictionary entry: gruesome