An example of something that would be described as gruesome is a violent murder scene.
Origin of gruesomefrom dialect, dialectal grue, to shudder ( from Middle English gruwen, akin to Middle High German from Indo-European base an unverified form ?hreu-, to grind down from source grit) + -some
Origin of gruesomeObsolete grue to shudder ( from Middle English gruen ) ( from Middle Dutch grūwen ) ( or Middle Low German gruwen ) -some 1
(comparative gruesomer or more gruesome, superlative gruesomest or most gruesome)
Compare Danish and Norwegian grusom (“horrible”), German grausam (“cruel”).