ILLUSORY
illusive, illusory
(adjective) based on or having the nature of an illusion; “illusive hopes 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”
Source: WordNet® 3.1
Etymology
Adjective
illusory (comparative more illusory, superlative most illusory)
Resulting from an illusion; deceptive, imaginary, unreal
Source: Wiktionary
Il*lu"so*ry, a. Etym: [Cf. F. illusore.]
Definition: Deceiving, or tending of deceive; fallacious; illusive; as,
illusory promises or hopes.
Source: Webster’s Unabridged Dictionary 1913 Edition