Illusory/ɪˈluːsəri/ Definition 1 of 1Pro Tip 1/3Perception Versus Reality Use 'illusory' to describe something that appears real but differs from objective reality. Her sense of security in the secluded cabin was illusory. Pro Tip 2/3Abstract Concepts 'Illusory' is often used to describe intangible concepts rather than physical objects. The notion of time travel remains largely illusory. Pro Tip 3/3Psychological Phenomena 'Illusory' applies to mental biases and false connections made by the brain. The gambler's winning streak was merely an illusory correlation.