the GNU version of the Collaborative International Dictionary of English
n. One who mumbles.
The Century Dictionary and Cyclopedia
n. One who mumbles.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a person who speaks softly and indistinctly
Word Usage
"Moby, the DJ/mumbler and longtime vegan whose television-commercial scores shook the world 10 years ago, has edited abook about how the meat industry is destroying the planet."