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
2. (verb) 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
3. (verb) mumble, mutter, maunder, mussitate
talk indistinctly; usually in a low voice
Synonyms: mutter, palaver, tittle-tattle, tattle, mussitate, blab, grumble, piffle, chatter, maunder, gibber, prate, croak, murmur, gum, clack, prattle, gnarl, gabble, blabber, mumble, twaddle
4. (verb) murmur, mutter, grumble, croak, gnarl
make complaining remarks or noises under one's breath
Synonyms: go, perish, snuff it, rumble, croak, decease, mutter, pass away, cash in one's chips, choke, mussitate, scold, grumble, cronk, drop dead, maunder, exit, pop off, growl, buy the farm, murmur, conk, grouch, die, give-up the ghost, pass, expire, gnarl, kick the bucket, mumble
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Synonyms and Antonyms of mutter 
