"grimness" in the noun sense
1. ghastliness, grimness, gruesomeness, luridness
the quality of being ghastly
2. asperity, grimness, hardship, rigor, rigour, severity, severeness, rigorousness, rigourousness
something hard to endure
"the asperity of northern winters"
Source: WordNet® (An amazing lexical database of English)
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