murmuring

Noun
  1. A low continuous indistinct sound;
    Often accompanied by movement of the lips without the production of articulate speech (synset 107401520)
  2. A complaint uttered in a low and indistinct tone (synset 107225752)
Adjective
  1. Making a low continuous indistinct sound (synset 301458817)
    "like murmuring waves"; "susurrant voices"

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