Which word describes a peaceable state of mind?

The word "serene" describes a peaceable state of mind because it conveys a sense of calmness and tranquility. When someone is serene, they experience a deep inner peace, free from disturbances and anxiety. This state is often associated with environments, situations, or emotional states that are undisturbed and harmonious, enabling a person to feel relaxed and content.

In contrast, "agitated," "restless," and "frantic" imply unease or turmoil. These words suggest a lack of peace and an overwhelming sense of disturbance. Agitated refers to being emotionally unsettled, restless indicates a constant state of wanting to move or being unable to relax, and frantic involves intense anxiety or panic, showcasing a stark difference from the calm state implied by "serene."