sage

In a sentence

• Le vieil homme était très sage et donnait de bons conseils.

  The old man was very wise and gave good advice.

  The word 'sage' is used as an adjective meaning 'wise', describing the old man's characteristic to give good advice.

• Le professeur a remarqué que l'élève était sage pendant tout le cours.

  The teacher noticed that the student was well-behaved throughout the class.

  Here, 'sage' is an adjective meaning 'well-behaved' or 'calm', referring to the student's conduct during the class.

• Émilie disait que sa petite sœur était aussi sage qu'une image.

  Émilie said that her little sister was as well-behaved as an image.

  In this sentence, 'sage' again means 'well-behaved', used in a simile to convey calmness and quiet behavior.