50 entries under utter topic. ×

2
drone(verb, low, buzz, babble)
2
sibilate(murmur, sigh)
2
tell(verb, talk, chatter, chat)
1
hum(low, hint, trace, buzz)
1
confide(murmur, sigh)
1
continuous sound(expression, low, buzz, babble)
1
drip(flow, babble, whisper, ripple)
1
express(verb, state, go, deliver, declare)
1
flow(babble, whisper, ripple, mumble)
1
gossip(hint, word, prattle, murmur)
1
hint(suggestion, trace, word, rumor)
1
insinuate(murmur, sigh)
1
intimate(murmur, sigh)
1
make low(expression, babble, whisper, mumble)
1
meander(flow, babble, whisper, ripple)
1
purr(low, flow, buzz, babble)
1
say(verb, state, go, deliver, express)
1
say softly(expression, murmur, sigh)
1
speak confidentially(expression, murmur, sigh)
1
speak softly(expression, murmur, sigh)
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APASmart Define. (2015). mutter thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/mutter/thesaurus/synonyms
ChicagoSmart Define. 2015. "mutter thesaurus" https://smartdefine.org/mutter/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, mutter thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/mutter/thesaurus/synonyms>.
MLASmart Define. "mutter thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/mutter/thesaurus/synonyms>