The characteristic or quality of being grisly(noun)
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Use "grisliness" in a sentence
"The fucking man lacks the "grisliness" of a real soldier."
"All did well, striking the right balance between news gathering and shock as to the grisliness of events, though one reporter, rushed to the scene from a city beat, got inappropriately overexcited as he told us that what he'd found striking about being in Cumbria on such a day was the sound of birdsong."
"The grisliness of the crime and its proximity to our classroom had a lasting impact on me."