1. (noun) mutter, muttering, murmur, murmuring, murmuration, mussitation
a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech
Synonyms: murmur vowel, murmuration, murmur, mussitation, grumbling, murmuring, grumble, muttering, heart murmur, mutter, cardiac murmur
Antonyms: loud
2. (adj) grumble, grumbling, murmur, murmuring, mutter, muttering
a complaint uttered in a low and indistinct tone
Synonyms: murmuration, mutter, mussitation, rumbling, murmur, grumbling, murmuring, grumble, rumble, heart murmur, murmur vowel, muttering, cardiac murmur
Antonyms: loud
3. (adj) murmuring, susurrant, whispering
making a low continuous indistinct sound
Synonyms: susurrant, whispering, murmuring
Antonyms: loud
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Synonyms for murmuring 
