IPA: /ɪˈluːsɪvnəs/
KK: /ɪˈluːsɪvnəs/
The quality of being deceptive or misleading, often creating a false impression.
The illusiveness of the mirage made it difficult for the travelers to find their way.
Illusiveness is formed from "illusio" (from Latin, meaning deception or mockery) and the suffix "-ness" (meaning the state or quality of). The word describes the quality of being deceptive or not real, as in something that is elusive or hard to grasp.
Think of 'deception' ('illusio') to remember that 'illusiveness' refers to the quality of being deceptive or hard to catch.