superflues

In a sentence

• Ces décorations sont superflues et n'ajoutent rien à l'atmosphère.

  These decorations are superfluous and add nothing to the atmosphere.

  The word 'superflues' is used here as an adjective describing the decorations as unnecessary or excessive.

• Elle préfère éviter les dépenses superflues pour économiser de l'argent.

  She prefers to avoid superfluous expenses to save money.

  Here, 'superflues' characterizes expenses, indicating they are unnecessary and can be avoided.

• Avant le déménagement, ils se sont débarrassés des choses superflues.

  Before moving, they got rid of superfluous things.

  In this example, 'superflues' describes the items deemed unnecessary and not worth keeping.