composed

When used as an adjective, this word describes a state of emotional stability and poise. It suggests a deliberate internal effort to remain serene, often in contrast to an external environment of chaos or hostility. It is more formal than "calm" and implies a level of sophistication or discipline in one's demeanor.

As a verb, the word is almost exclusively used in the passive voice ("be composed of") to describe the structural makeup of an entity. While "consist of" is a close synonym, "composed of" often emphasizes the individual components that have been brought together to form a whole.