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