Most common:
* Pacifique: This is the most common and direct translation of "peaceful."
* Paisible: This is another common translation, often used to describe a state of peace or tranquility.
Other options:
* Tranquille: This translates to "calm" or "serene" and can be used to describe a peaceful atmosphere or state of mind.
* Calme: This means "calm" and can be used to describe a peaceful situation or person.
* Harmonieux: This translates to "harmonious" and can be used to describe a peaceful relationship or environment.
The best translation will depend on the specific context.