Here are some examples:
* Un train lent: A slow train.
* Une musique lente: Slow music.
* Parlez plus lentement: Speak more slowly.
There are other ways to say "slow" in French, depending on the context. For example:
* "Ralentir" means "to slow down" or "to make something slow down."
* "Pauvre" can be used to describe something as "slow" in a negative way, like "a slow learner" ("un élève pauvre").
However, "lent" is the most general and common way to say "slow" in French.