The Collaborative International Dictionary of English v.0.48:
Unreality \Un`re*al"i*ty\, n. The quality or state of being unreal; want of reality. [1913 Webster]WordNet (r) 3.0 (2006):
unreality n 1: the quality possessed by something that is unreal [ant: reality] 2: the state of being insubstantial or imaginary; not existing objectively or in fact [syn: unreality, irreality] [ant: realism, reality, realness]