The antonyms for the word "most loud voiced" can vary depending on the context in which it is used. Generally speaking, the opposite of "loud" is "quiet" or "soft." Therefore, some potential antonyms for "most loud voiced" could be "soft-spoken," "unobtrusive," "muted," or "hushed." Other antonyms could include "whispered," "murmured," or "muffled." In some cases, the opposite of "loud" could also be "moderate," "restrained," or "subdued." Ultimately, the appropriate antonym will depend on the intended meaning and context of the phrase "most loud voiced.