mumbler

from WordNet (r) 3.0 (2006)
mumbler
    n 1: a person who speaks softly and indistinctly [syn:
         {mutterer}, {mumbler}, {murmurer}]
from The Collaborative International Dictionary of English v.0.48
Mumbler \Mum"bler\, n.
   One who mumbles.
   [1913 Webster]
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