Which word describes a state of calmness and peace?

The term "serene" encapsulates a state of calmness and peace, embodying tranquility and an absence of disturbance. It is often used to describe environments, emotions, or individuals who exhibit a serene demeanor, suggesting a profound sense of composure and ease. This word invokes imagery of peaceful landscapes or a clear sky, reinforcing the idea of a soothing and harmonious atmosphere. In contrast, the other terms convey a sense of unrest or turmoil: "agitated" implies disturbance or anxiety, "frenetic" suggests chaotic energy or frenzied activity, and "restless" denotes a lack of calm, characterized by an inability to relax or remain still. Therefore, "serene" stands out as the ideal choice reflecting calmness and peace.