IPA: /ɪˈluːzərɪnəs/
KK: /ɪˈluːzərɪnəs/
The state or quality of being deceptive or not real, often creating a false impression.
The illusoriness of the magician's tricks left the audience in awe.
Illusoriness → It is formed from "illusio" (from Latin, meaning deception or mockery) and the suffix "-ness" (meaning the state or quality of). The word describes the state of being deceptive or illusory.
Think of 'illusion' as a form of 'deception' ('illusio') and remember that '-ness' indicates a state. So, illusoriness refers to the quality of being deceptive.