21 entries under tight-lipped topic. ×

19
silent(adjective, close, quiet, smooth, soft)
18
still(adjective, adverb, calm, close, quiet)
16
hushed(adjective, close, quiet, smooth, soft)
15
quiet(adjective, close, smooth, soft, low)
6
mute(adjective, close, quiet, soft, low)
5
dumb(adjective, close, quiet, soft, low)
4
muted(adjective, close, quiet, soft, low)
1
bashful(quiet, still, shy, silent, hushed)
1
buttoned up(expression, adjective, close, quiet, smooth)
1
clammed up(expression, adjective, close, quiet, smooth)
1
reserved(adjective, close, quiet, soft, low)
1
secretive(adjective, close, quiet, soft, low)
1
speechless(adjective, close, quiet, soft, low)
1
taciturn(adjective, close, quiet, soft, low)
1
tongue-tied(quiet, still, shy, silent, hushed)
1
uncommunicative(adjective, close, quiet, soft, low)
1
unsociable(quiet, still, shy, silent, hushed)
1
unspeaking(adjective, close, quiet, soft, low)
1
wordless(quiet, soft, low, still, silent)
1
zipped(quiet, still, shy, silent, hushed)
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APASmart Define. (2015). soundless thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/soundless/thesaurus/synonyms
ChicagoSmart Define. 2015. "soundless thesaurus" https://smartdefine.org/soundless/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2015, soundless thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/soundless/thesaurus/synonyms>.
MLASmart Define. "soundless thesaurus" 13 April 2015. Web. 30 September 2026. <https://smartdefine.org/soundless/thesaurus/synonyms>