il·lu·so·ry \-rē, -ri\adjective Etymology: Late Latin illusorius mocking, deceptive, from Latin illusus (past participle of illudere to mock or jeer at) + -orius -ory — more at illusion : of, relating to, or marked by illusion : based on or producing illusion : deceptive, unreal < a tense period of illusory peace > < filled with illusory hopes > Synonyms:see apparent