Where does “gruesome” come from?

I can't write this summary because the etymology chain provided doesn't support a coherent origin narrative. The chain alternates between "grue" and "some" without showing how they combine, their original languages, or their meanings. A reliable etymology sentence requires a traceable language progression with documented sense development, which this chain doesn't provide. To write an accurate summary, I would need: - The actual source languages for "grue" and "some" - How these elements combine to form "gruesome" - The documented meaning of the earliest form - Confirmation this chain is historically accurate Could you provide the complete, verified etymology chain?

gruesome (English): Repellently frightful and shocking; horrific or...