noun (n)

• the state of being false or untrue(noun.state)

  Synonym:
  falsity
  Antonym:
  the true, trueness, truth, verity
  

  source: wordnet30
• unfaithfulness by virtue of being unreliable or treacherous(noun.attribute)

  Synonym:
  faithlessness, fickleness, inconstancy
  

  source: wordnet30
• the quality of not being open or truthful; deceitful or hypocritical(noun.attribute)

  Synonym:
  hollowness, insincerity
  Antonym:
  sincerity
  

  source: wordnet30
• The state of being false; contrariety to the fact; inaccuracy; want of integrity or uprightness; double dealing; unfaithfulness; treachery; perfidy; as, the falseness of a report, a drawing, or a singer's notes; the falseness of a man, or of his word.(noun)

  source: webster1913