Source : Webster's Revised Unabridged Dictionary (1913)

Illusory \Il*lu"so*ry\, a. [Cf. F. illusore.]
   Deceiving, or tending of deceive; fallacious; illusive; as,
   illusory promises or hopes.

Source : WordNet®

illusory
     adj : based on or having the nature of an illusion; "illusive
           hopes of of finding a better job"; "Secret activities
           offer presidents the alluring but often illusory
           promise that they can achieve foreign policy goals
           without the bothersome debate and open decision that
           are staples of democracy" [syn: {illusive}]