fictional, fictitious
La historia que voy a contar es completamente ficticia.
The story I am about to tell is entirely fictional.
Por esta enfermedad ficticia, Amélie no va a la escuela.
Because of this fictional illness, Amélie does not go to school.
— Amelie (2001)
Es una novela, nada más que una historia ficticia.
It's a novel, nothing more than a fictional story.
— La gran belleza (2013)