Muttering is the indistinct grumbling sound of voices. The muttering in your math classroom might make it hard for you to concentrate on your work.

Muttering is usually unintelligible — you can't hear what people are saying, just that they're saying it. Muttering is usually also characterized by dissatisfaction. The continued muttering in an office may inspire a business's owner to offer every employee a raise, simply to put an end to the complaints. Muttering, like the verb mutter, comes from an imitative root, mut.

Definitions of muttering
  1. noun
    a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech
    synonyms: murmur, murmuration, murmuring, mussitation, mutter
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    type of:
    the sudden occurrence of an audible event
  2. noun
    a complaint uttered in a low and indistinct tone
    synonyms: grumble, grumbling, murmur, murmuring, mutter
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    type of:
    an expression of grievance or resentment
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