fictif

In a sentence

• Le personnage principal du roman est totalement fictif.

  The main character of the novel is entirely fictional.

  Here, 'fictif' is used to describe something created in imagination, not real.

• Ils racontaient souvent des histoires fictives aux enfants.

  They often told fictional stories to children.

  In this sentence, 'fictif' characterizes the nature of the stories as imaginary or invented.

• Ce problème mathématique était fictif, conçu pour l'exercice.

  This mathematics problem was fictitious, designed for the exercise.

  The word 'fictif' is applied to an invented situation for educational purposes, not representing a real problem.