noun (n)

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

  Synonym:
  abruptness, precipitancy, precipitateness, precipitousness, suddenness
  

  source: wordnet30
• The quality or state of being precipitant, or precipitate; headlong hurry; excessive or rash haste in resolving, forming an opinion, or executing a purpose; precipitation; as, the precipitancy of youth.(noun)

  source: webster1913