The quality of being gruesome; the state of being extremely unpleasant, horrifying, or disgusting, especially in a violent way.
From 'gruesome' (from Scandinavian roots, possibly Middle Low German 'grusam,' meaning to shudder) plus '-ness' (suffix creating abstract nouns from adjectives).
The word 'gruesome' likely has Scandinavian origins, making sense because Viking sagas are absolutely packed with graphic violence and body horror—the language evolved where depicting gore was practically a literary requirement.
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