adjective (a)

• lacking in reality or substance or genuineness; not corresponding to acknowledged facts or criteria(adj.all)

  Example:
  Ghosts and other unreal entities.
  Unreal propaganda serving as news.
  

  Antonym:
  existent, real
  

  source: wordnet30
• not actually such; being or seeming fanciful or imaginary(adj.all)

  Example:
  This conversation is getting more and more unreal.
  The fantastically unreal world of government bureaucracy.
  The unreal world of advertising art.
  

  Antonym:
  real
  

  source: wordnet30
• contrived by art rather than nature(adj.all)

  Synonym:
  artificial
  Antonym:
  natural
  

  source: wordnet30
• lacking material form or substance; unreal(adj.all)

  Synonym:
  insubstantial, unsubstantial
  Antonym:
  material, real, substantial
  

  source: wordnet30
• Not real; unsubstantial; fanciful; ideal.(adjective)

  source: webster1913