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Noun: rigorousness  ri-gu-rus-nus
  1. The quality of being hard to endure, uninviting or formidable
    - asperity, grimness, hardship, rigor [US], rigour [Brit, Cdn], severity, severeness, rigourousness [Brit, non-standard]
  2. Excessive sternness
    "rigorousness of character";
    - severity, severeness, harshness, rigor [US], rigour [Brit, Cdn], rigourousness [Brit, non-standard], inclemency, hardness, stiffness

Type of: difficultness, difficulty, sternness, strictness