| struck dumb(expression, adjective, still, hushed, soundless) | |
| terse | |
| tightlipped(adjective, taciturn) | |
| tranquillity | |
| tush(noun, taciturnity) | |
| tut | |
| un-talkative(adjective, taciturn) | |
| unclear(quiet, soft, low, still, hushed) | |
| understood | |
| unexpressive(aloof, reserved, reticent, uncommunicative) | |
| unheard(adjective, still, silent, hushed, soundless) | |
| unloquacious | |
| unspeaking(adjective, quiet, restrained, still, silent) | |
| unspoken(adjective, silent, muffled, voiceless) | |
| withdrawn(aloof, reserved, reticent, silent, uncommunicative) | |
| word-bound | |
| zipped(adjective, quiet, still, reticent, silent) | |
| Keep quiet | |
| Keep secret | |
| Keep silent |
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| APA | Smart Define. (2015). mum thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/mum/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "mum thesaurus" https://smartdefine.org/mum/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, mum thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/mum/thesaurus/synonyms>. |
| MLA | Smart Define. "mum thesaurus" 13 April 2015. Web. 24 September 2026. <https://smartdefine.org/mum/thesaurus/synonyms> |