| noun | a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech |
| noun | a complaint uttered in a low and indistinct tone |
| verb | speak softly or indistinctly “She murmured softly to the baby in her arms” |
| verb | make complaining remarks or noises under one's breath “she grumbles when she feels overworked” |
| adjective | making a low continuous indistinct sound “like murmuring waves” |
| mutter | verb | talk indistinctly; usually in a low voice |
| mutterer | noun | a person who speaks softly and indistinctly |
| murmurous | adjective | characterized by soft sounds; ; ; - R.P.Warren |
| murmur | verb | speak softly or indistinctly |
| murmurer | noun | a person who speaks softly and indistinctly |
| mussitate | verb | talk indistinctly; usually in a low voice |
| grumble | verb | make complaining remarks or noises under one's breath |
| murmur | noun | a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech |
| murmuration | noun | a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech |
| murmuring | noun | a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech |
| mutter | noun | a complaint uttered in a low and indistinct tone |
| muttering | noun | a complaint uttered in a low and indistinct tone |
| grumble | noun | a complaint uttered in a low and indistinct tone |
| grumbler | noun | a person given to excessive complaints and crying and whining |
| grumbling | noun | a complaint uttered in a low and indistinct tone |
| susurrate | verb | issue soft noises |