* "Ranci" is the most common and general term for "stale" in French. It can be used for bread, food, or even ideas that are outdated.
* "Moisi" refers specifically to something that is moldy, which can be a cause of staleness.
* "Rassie" can be used for stale bread or other baked goods.
* "Désuet" is used to describe something outdated or obsolete, often in a more formal context.
The best translation will depend on the specific situation and what you are trying to communicate.