noun (n)

• unfaithfulness by virtue of being unreliable or treacherous(noun.attribute)

  Synonym:
  faithlessness, falseness, fickleness
  

  source: wordnet30
• the quality of being changeable and variable(noun.attribute)

  Synonym:
  changefulness
  Antonym:
  constancy, stability
  

  source: wordnet30
• The quality or state of being inconstant; want of constancy; mutability; fickleness; variableness.(noun)

  source: webster1913