noun (n)

• something hard to endure(noun.attribute)

  Example:
  The asperity of northern winters.
  

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

  source: wordnet30
• harshness of manner(noun.attribute)

  Synonym:
  sharpness
  Antonym:
  bluntness, dullness
  

  source: wordnet30
• Roughness of surface; unevenness; -- opposed to smoothness.(noun)

  source: webster1913