"murmuring" in the noun sense
1. mutter, muttering, murmur, murmuring, murmuration, mussitation
a low continuous indistinct sound often accompanied by movement of the lips without the production of articulate speech
2. grumble, grumbling, murmur, murmuring, mutter, muttering
a complaint uttered in a low and indistinct tone
"murmuring" in the verb sense
1. murmur
speak softly or indistinctly
"She murmured softly to the baby in her arms"
2. murmur, mutter, grumble, croak, gnarl
make complaining remarks or noises under one's breath
"she grumbles when she feels overworked"
"murmuring" in the adjective sense
1. murmuring, susurrant, whispering
making a low continuous indistinct sound
"like murmuring waves"
"susurrant voices"
Source: WordNet® (An amazing lexical database of English)
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