mumble
/ˈmʌmbəl/
verb
- To speak quietly and unclearly, often with the mouth partly closed.
- She mumbled an apology and quickly left the room.
- He tends to mumble when he's tired, so it's hard to understand him.
- Please don't mumble; speak up so everyone can hear.
noun
- Quiet, unclear speech.
- His answer was just a mumble, so I asked him to repeat it.
- The teacher ignored the mumble of complaints from the back of the class.
- I could hear a mumble coming from the other room.