14
hesitant
7
hard
6
inarticulate
4
effortful(adjective, quiet, snapper)
4
gluey
4
mumbling
3
awkward
3
gummy
3
mute
3
problematic
3
speechless
2
abstruse
2
coagulated
2
gelatinous
2
glutinous
2
grueling
2
halting
2
labored
2
mum
2
taciturn(adjective, talkative, uncommunicative)
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APASmart Define. (2015). fluent thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/fluent/thesaurus/antonyms
ChicagoSmart Define. 2015. "fluent thesaurus" https://smartdefine.org/fluent/thesaurus/antonyms (accessed September 22, 2026).
HarvardSmart Define 2015, fluent thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/fluent/thesaurus/antonyms>.
MLASmart Define. "fluent thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/fluent/thesaurus/antonyms>