The antonyms for the word "most muted" would be words that describe extreme sound levels. These could include loud, boisterous, noisy, thunderous, booming, ear-splitting, or cacophonous. These words suggest a powerful, intense sound that commands attention and may even be overwhelming. In contrast, "most muted" implies a low or subdued sound that is subtle and perhaps even hard to hear. The antonyms for "most muted" are opposites that connote energy, urgency, and vibrancy. Depending on the context, these opposing words could provide a stark contrast that enhances meaning and underscores a key idea or emotion.