| unsounded(adjective, silent, muffled, voiceless) | |
| untalkative | |
| am | |
| Say nothing(noun, expression, idiom, taciturnity) | |
| aloof(reserved, reticent, uncommunicative) | |
| anaudic | |
| antisocial(aloof, reserved, reticent, uncommunicative) | |
| brief | |
| brooding(aloof, reserved, reticent, uncommunicative) | |
| brusque | |
| buttoned up(expression, adjective, quiet, soft, reticent) | |
| checked(quiet, soft, still, silent, hushed) | |
| chrysanthemum | |
| close-tongued | |
| closed up(expression, adjective, quiet, soft, still) | |
| cold(aloof, reserved, reticent, uncommunicative) | |
| concise | |
| curbed(quiet, soft, still, silent, hushed) | |
| dead | |
| dead of night(expression, idiom) |
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| APA | Smart Define. (2015). mum thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/mum/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "mum thesaurus" https://smartdefine.org/mum/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, mum thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/mum/thesaurus/synonyms>. |
| MLA | Smart Define. "mum thesaurus" 13 April 2015. Web. 23 September 2026. <https://smartdefine.org/mum/thesaurus/synonyms> |