Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun muttering

2 senses of muttering

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)
       => sound -- (the sudden occurrence of an audible event; "the sound awakened them")

Sense 2
grumble, grumbling, murmur, murmuring, mutter, muttering -- (a complaint uttered in a low and indistinct tone)
       => complaint -- (an expression of grievance or resentment)

Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb mutter

2 senses of mutter

Sense 1
mumble, mutter, maunder, mussitate -- (talk indistinctly; usually in a low voice)
       => talk, speak, utter, mouth, verbalize, verbalise -- (express in speech; "She talks a lot of nonsense"; "This depressed patient does not verbalize")

Sense 2
murmur, mutter, grumble, croak, gnarl -- (make complaining remarks or noises under one's breath; "she grumbles when she feels overworked")
       => complain, kick, plain, sound off, quetch, kvetch -- (express complaints, discontent, displeasure, or unhappiness; "My mother complains all day"; "She has a lot to kick about")