English to English

noun (n)

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

  Synonym:
  abruptness, precipitousness
  Antonym:
  gentleness, gradualness
  

  source: wordnet30
• Quality or state of being steep; precipitous declivity; as, the steepnessof a hill or a roof.(noun)

  source: webster1913