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mumble(verb, inarticulately)
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bombilate
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bummed
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bumming
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find fault
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gripe
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grumble
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hum
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murmur(verb, sound, low)
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mutter(verb, grumble, mumble)
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prattling
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psych out(expression, fix)
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sing low
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speak(hold, keep)
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whisper(verb, shout, prattling, purring, yakkety-yak)
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APASmart Define. (2011). speak clearly thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/speak_clearly/thesaurus/antonyms
ChicagoSmart Define. 2011. "speak clearly thesaurus" https://smartdefine.org/speak_clearly/thesaurus/antonyms (accessed September 23, 2026).
HarvardSmart Define 2011, speak clearly thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/speak_clearly/thesaurus/antonyms>.
MLASmart Define. "speak clearly thesaurus" 23 May 2011. Web. 23 September 2026. <https://smartdefine.org/speak_clearly/thesaurus/antonyms>