It is often used to describe:
* Characters or events in stories: A fictional character is one that is made up, like Harry Potter or Sherlock Holmes.
* False or fabricated information: A fictitious address or name is one that is not real.
* Something that is not genuine: A fictitious claim is one that is not true.
Here are some synonyms for fictitious:
* Imaginary
* Fake
* False
* Unreal
* Made-up
* Invented
* Fabricated
* Counterfeit
Example:
* "The detective was investigating a fictitious robbery." (The robbery was not real.)
* "The author created a fictitious world filled with magical creatures." (The world and creatures are imaginary.)