General:
* Relaxant: This is the most common and direct translation. It's used to describe something that promotes relaxation, like a "relaxant massage".
* Détente: This word means "relaxation" or "ease" and can be used to describe a state of being or a feeling.
* Détendu: This adjective means "relaxed" and can be used to describe a person or their demeanor.
Other possibilities:
* Calmant: This means "soothing" or "calming" and can be used to describe something that helps you relax.
* Apaisant: This means "soothing" or "pacifying" and has a similar meaning to "calmant".
Example sentences:
* Le bain chaud est très relaxant. (The hot bath is very relaxing.)
* Il a un air détendu. (He has a relaxed air.)
* La musique est très apaisante. (The music is very soothing.)
The best choice depends on the specific situation and the nuance you want to convey.