illusory (adj.)youdaoicibaDictYouDict[illusory 词源字典]
1590s, from French illusorie, from Late Latin illusorius "ironical, of a mocking character," from illus-, past participle stem of Latin illudere "mock at," literally "to play with," from assimilated form of in- "at, upon" (see in- (2)) + ludere "to play" (see ludicrous).[illusory etymology, illusory origin, 英语词源]