The phrase "most racket" refers to a loud and disturbing noise. Antonyms for this phrase could include "peaceful," "quiet," "serene," "calm," and "tranquil." These words describe an environment that is free from noise and commotion. Alternatively, one could use the terms "harmony," "oscillation," or "melody," which connote a pleasant and harmonious sound rather than a disruptive one. Other antonyms for "most racket" might include "still," "mute," and "soundless," which suggest complete silence. Regardless of the context, these antonyms help to convey a clear picture of a peaceful and quiet environment that is free from disturbing noises.