There are many ways to describe a state of being free from agitation. Some synonyms include calm, serene, peaceful, tranquil, undisturbed, unperturbed, untroubled, placid, relaxed, composed, steady, and even-tempered. These words can be used to describe a person's emotional state, or a situation or environment that is lacking in chaos or disturbance. Achieving a state of calmness and tranquility is important for mental and emotional well-being, and can lead to greater feelings of happiness and contentment. So if you're feeling agitated or stressed, try using some of these synonyms to describe the state of mind you want to achieve.