1
rumble(noun, low, buzz)
1
rustling
1
sigh
1
soft voice
1
spluttering(verb, stammering)
1
sputtering
1
stage whisper
1
still small voice(expression, idiom)
1
sulky
1
susurrant
1
susurrous
1
unaccepting
1
unaccommodating
1
underbreath
1
uneasy
1
unfulfilled
1
ungoverned
1
ungratified
1
unhappy
1
unsatisfied
11 years ago|3.8k views|share |citing 
APASmart Define. (2015). muttering thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/muttering/thesaurus/synonyms
ChicagoSmart Define. 2015. "muttering thesaurus" https://smartdefine.org/muttering/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, muttering thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/muttering/thesaurus/synonyms>.
MLASmart Define. "muttering thesaurus" 13 April 2015. Web. 23 September 2026. <https://smartdefine.org/muttering/thesaurus/synonyms>