Synonyms|53Antonyms|8|Broader|0Narrower|0Related|1
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special(adjective, exceptional)
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sub-rosa
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sub rosa
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surreptitious
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top secret(expression, adjective, exceptional, sensitive, private)
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unacknowledged(sensitive, sub-rosa)
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under-the-table(sensitive, sub-rosa)
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under false pretense(expression, idiom, sensitive, sub-rosa)
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under the table(expression, idiom, sensitive, sub-rosa)
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under wraps(expression, sensitive, sub-rosa)
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undisclosed
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with a lid on(expression, idiom, sensitive, sub-rosa)
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within these four walls(expression, idiom, adverb, sensitive, confidential)
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APASmart Define. (2015). not for publication thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/not_for_publication/thesaurus/synonyms
ChicagoSmart Define. 2015. "not for publication thesaurus" https://smartdefine.org/not_for_publication/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, not for publication thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/not_for_publication/thesaurus/synonyms>.
MLASmart Define. "not for publication thesaurus" 14 April 2015. Web. 29 September 2026. <https://smartdefine.org/not_for_publication/thesaurus/synonyms>