The word murmurers means people who speak in a low or indistinct voice. Some synonyms for murmurers are whisperers, mutterers, mumbles, murmurs, and grumblers. Whisperers refer to people who speak quietly, often as if they do not want to be overheard. Mutterers are those who speak in a low tone, sometimes as if they are complaining. Mumbles also refers to speaking in a low voice, but with unclear pronunciation. Murmurs are soft, muffled sounds that are often created by a low volume when speaking. Grumblers are those who complain or express dissatisfaction frequently. All these words share a common meaning expressed through the tone of the speaker's voice.