mutter

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, muttering
  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, muttering
Verb
  1. Talk indistinctly;
    Usually in a low voice (synset 201046405)
    is a type of: mouth, speak, talk, utter, verbalise, verbalize - express in speech
    same as: maunder, mumble, mussitate
  2. Make complaining remarks or noises under one's breath (synset 200911172)
    "she grumbles when she feels overworked"
    is a type of: complain, kick, kvetch, plain, quetch, sound off - express complaints, discontent, displeasure, or unhappiness
    same as: croak, gnarl, grumble, murmur

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