noun (n)

• the property possessed by a slope that is very steep(noun.attribute)

  Synonym:
  abruptness, steepness
  Antonym:
  gentleness, gradualness
  

  source: wordnet30
• the quality of happening with headlong haste or without warning(noun.attribute)

  Synonym:
  abruptness, precipitance, precipitancy, precipitateness, suddenness
  

  source: wordnet30