"mutterings" 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
Source: WordNet® (An amazing lexical database of English)
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