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

Type of: difficultness, difficulty, sternness, strictness