mutterer

from WordNet (r) 3.0 (2006)
mutterer
    n 1: a person who speaks softly and indistinctly [syn:
         {mutterer}, {mumbler}, {murmurer}]
from The Collaborative International Dictionary of English v.0.48
Mutterer \Mut"ter*er\, n.
   One who mutters.
   [1913 Webster]
from Moby Thesaurus II by Grady Ward, 1.0
23 Moby Thesaurus words for "mutterer":
      bellyacher, complainant, complainer, crab, crank, croaker,
      faultfinder, frondeur, griper, grouch, grouser, growler, grumbler,
      kicker, kvetch, malcontent, murmurer, querulous person,
      reactionary, reactionist, rebel, sorehead, whiner
antiflux / dictionary / mutterer
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