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tight-lipped(quiet, shy, silent)
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unhearable(quiet, soft, low)
13 years ago|1.1k views|share |citing 
APASmart Define. (2013). nonvocal thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/nonvocal/thesaurus/synonyms
ChicagoSmart Define. 2013. "nonvocal thesaurus" https://smartdefine.org/nonvocal/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2013, nonvocal thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/nonvocal/thesaurus/synonyms>.
MLASmart Define. "nonvocal thesaurus" 28 June 2013. Web. 25 September 2026. <https://smartdefine.org/nonvocal/thesaurus/synonyms>