What is the meaning of unreal?

adjective

• Lacking in reality or substance or genuineness; not corresponding to acknowledged facts or criteria.
  • usage: "ghosts and other unreal entities"; "unreal propaganda serving as news"
• Not actually such; being or seeming fanciful or imaginary.
  • usage: "this conversation is getting more and more unreal"; "the fantastically unreal world of government bureaucracy"; "the unreal world of advertising art"
• Contrived by art rather than nature.
  • usage: "artificial flowers"; "artificial flavoring"; "an artificial diamond"; "artificial fibers"; "artificial sweeteners"
  • synonyms: artificial
• Lacking material form or substance; unreal.
  • usage: "as insubstantial as a dream"; "an insubstantial mirage on the horizon"
  • synonyms: insubstantial, unsubstantial