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Noun: grimness  grim-nus
  1. The quality of being ghastly
    - ghastliness, gruesomeness, luridness
  2. The quality of being hard to endure, uninviting or formidable
    "the grimness of northern winters";
    - asperity, hardship, rigor [US], rigour [Brit, Cdn], severity, severeness, rigorousness, rigourousness [Brit, non-standard]

Type of: difficultness, difficulty, fix [informal], frightfulness, hole [informal], jam [informal], kettle of fish [informal], mess [informal], muddle [informal], pickle [informal]