noun
a person who mutters, speaks in a low, indistinct tone
-
The mutterer in the back of the room was asked to speak up so everyone could hear.
-
I couldn't make out what the mutterer was saying during the meeting.
-
The mutterer over there is always grumbling about something.
-
She was known as the mutterer of the family, always whispering comments under her breath.