Here are some examples of how it can be used:
* Faible en mathématiques: Weak in mathematics.
* Un signal faible: A weak signal.
* Un faible appétit: A low appetite.
It can also be used figuratively to describe something that is not strong or powerful:
* Un esprit faible: A weak mind.
* Une volonté faible: A weak will.
"Faible" can also refer to something that is small or insignificant:
* Une faible quantité: A small quantity.
* Un faible intérêt: A small interest.
The word "faible" is often used in contrast to "fort" (strong) and "grand" (big).