muttering

Noun
  1. A low continuous indistinct sound;
    Often accompanied by movement of the lips without the production of articulate speech (synset 107401520)
    is a type of: sound - the sudden occurrence of an audible event
    same as: murmur, murmuration, murmuring, mussitation, mutter
  2. A complaint uttered in a low and indistinct tone (synset 107225752)
    is a type of: complaint - an expression of grievance or resentment
    same as: grumble, grumbling, murmur, murmuring, mutter

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