General Relaxed Attitude:
* Décontracté(e): This is the most common and general term, meaning "relaxed" or "casual." It applies to both a person's attitude and their style of dress.
* Cool: This word, borrowed from English, is used to describe someone who is relaxed and unconcerned.
* Zen: This term is often used to describe someone who is calm and serene, with a relaxed and accepting attitude.
Specific to Being Unstressed:
* Apaisé(e): This word means "calm" or "tranquil," suggesting a relaxed state of mind and a lack of stress.
* Détendu(e): This term means "relaxed" or "unstressed," implying a sense of ease and comfort.
* Nonchalant(e): This word means "casual" or "indifferent," suggesting a relaxed and unbothered attitude.
Other Options:
* Sans prise de tête: This phrase literally means "without taking things to heart," suggesting a relaxed and carefree attitude.
* Aller avec le flow: This is a more colloquial phrase, meaning "to go with the flow," suggesting a flexible and adaptable attitude.
The best translation will depend on the specific context and the nuance you want to convey.