rigorousness

Noun
  1. is a type of: difficultness, difficulty - the quality of being difficult
    subtypes: sternness - the quality (as of scenery) being grim and gloomy and forbidding
    same as: asperity, grimness, hardship, rigor, rigour, rigourousness, severeness, severity
  2. is a type of: sternness, strictness - uncompromising resolution
    same as: hardness, harshness, inclemency, rigor, rigour, rigourousness, severeness, severity, stiffness

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