Noun grimness has 2 senses
  1. ghastliness, grimness, gruesomeness, luridness - the quality of being ghastly
    --1 is a kind of frightfulness
  2. asperity, grimness, hardship, rigor, rigour, severity, rigorousness - something hard to endure; "the asperity of northern winters"
    --2 is a kind of difficulty, difficultness
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