The antonyms for the word "most murmuring" could be "silent", "quiet", "calm", "serene", "tranquil", "peaceful", "untroubled", "placid", "composed", "still", "hushed", "mute", or "soundless". These words represent the opposite of the noisy and indistinct sound of murmuring. Hence, using these antonyms would significantly change the context of the sentence to convey a sense of peace and quiet instead of the usual disturbance of murmuring. Selecting the right antonym is crucial when writing to convey the intended meaning accurately. Therefore, it is essential to understand the nuances of each word and their opposite to use them effectively in writing.