mutterer

Next to us, by sheer chance – this isn’t entirely common around here – was a table with some gay men we didn’t know who remained blissfully unaware of the mutterer.

One is a mumbling mutterer, the other speaks with methodical precision.

That German mutterer at the Globe had no apparent talent for anything but verbal abuse.

I'm not a mumbler or mutterer, but I do speak softly.

A hater of pork, a wearer of gowns, a mutterer of prayers, a bearded clown of a rustic!