noun (n)

• something hard to endure(noun.attribute)

  Synonym:
  asperity, grimness, hardship, rigor, rigorousness, rigour, severeness, severity
  

  source: wordnet30
• excessive sternness(noun.attribute)

  Synonym:
  hardness, harshness, inclemency, rigor, rigorousness, rigour, severeness, severity, stiffness
  

  source: wordnet30