mutterer
/ˈmʌtərər/
noun
- A person who speaks quietly and unclearly, often in a way that shows they are annoyed or unhappy.
- She was known as a mutterer, always grumbling about the weather.
- The teacher asked the mutterer to speak up so everyone could hear.
- The old mutterer in the corner complained about the noise under his breath.
Synonyms