mutterer
A mutterer is a person who speaks in a low, indistinct, or inarticulate way. This manner of speaking can be characterized by a lack of clarity, where the words are not fully formed or are spoken too softly to be easily understood by others. The sound produced by a mutterer is often a jumble of syllables, making it difficult to decipher their intended message. This can occur for a variety of reasons, including shyness, a lack of confidence, a physical impediment, or simply a habit.
The term "mutterer" is descriptive and focuses on the audibility and intelligibility of the speech. It is