Tumultuous refers to a state of chaos, confusion, or uproar. Antonyms for this word include calm, peaceful, tranquil, orderly, and serene. When things are calm, there is no disturbance or agitation, and the atmosphere is relaxed and undisturbed. Peaceful means free from conflict or tension, bringing a sense of calm and tranquility. A tranquil environment is serene, quiet, and soothing, devoid of any disturbance or disruption. Orderly implies a sense of organization, structure, and discipline, where everything is in its proper place. Lastly, serene is a state of being calm, clear, and peaceful, characterized by a sense of harmony and balance.