noun (n)

• the quality possessed by something that is unreal(noun.attribute)

  Antonym:
  reality
  

  source: wordnet30
• the state of being insubstantial or imaginary; not existing objectively or in fact(noun.state)

  Synonym:
  irreality
  Antonym:
  realism, reality, realness
  

  source: wordnet30
• The quality or state of being unreal; want of reality.(noun)

  source: webster1913