73 entries under adjective topic. ×

4
close(quiet, soft, restrained, still)
4
close-lipped(quiet, silent, taciturn)
4
close-mouthed(quiet, restrained, aloof, reserved)
4
closemouthed(close, quiet, soft, low)
3
incommunicative
3
noiseless(quiet, soft, low, still)
2
bashful(quiet, soft, restrained, awkward)
2
clammed up(expression, quiet, restrained, reticent)
2
muted(quiet, soft, low, reticent)
2
nonvocal(quiet, soft, low, still)
2
succinct
2
tacit
2
unforthcoming(close, quiet, restrained, aloof)
2
unsociable(quiet, still, silent, hushed)
2
unsounded(silent, muffled, voiceless)
2
untalkative
1
buttoned up(expression, quiet, soft, reticent)
1
closed up(expression, quiet, soft, still)
1
dummied up(expression, quiet, soft, restrained)
1
iced(quiet, soft, still, silent)
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APASmart Define. (2015). mum thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/mum/thesaurus/synonyms
ChicagoSmart Define. 2015. "mum thesaurus" https://smartdefine.org/mum/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, mum thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/mum/thesaurus/synonyms>.
MLASmart Define. "mum thesaurus" 13 April 2015. Web. 25 September 2026. <https://smartdefine.org/mum/thesaurus/synonyms>