Source : Webster's Revised Unabridged Dictionary (1913)

Unreal \Un*re"al\, a.
   Not real; unsubstantial; fanciful; ideal.

Source : WordNet®

unreal
     adj 1: lacking in reality or substance or genuineness; not
            corresponding to acknowledged facts or criteria;
            "ghosts and other unreal entities"; "unreal propaganda
            serving as news" [ant: {real}]
     2: not actually such; being or seeming fanciful or imaginary;
        "this conversation is getting more and more unreal"; "the
        fantastically unreal world of government bureaucracy";
        "the unreal world of advertising art" [ant: {real(a)}]
     3: contrived by art rather than nature; "artificial flowers";
        "artificial flavoring"; "an artificial diamond";
        "artificial fibers"; "artificial sweeteners" [syn: {artificial}]
        [ant: {natural}]
     4: lacking material form or substance; unreal; "as
        insubstantial as a dream"; "an insubstantial mirage on the
        horizon" [syn: {insubstantial}, {unsubstantial}] [ant: {substantial}]