Synonyms|111Antonyms|0|Broader|1Narrower|0Related|6
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underground(clandestine, undisclosed)
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underhand(clandestine, underground, undisclosed)
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unenlightened(clandestine, underground, undisclosed)
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unexposed
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unfrequented(clandestine, underground, undisclosed)
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unintelligible(clandestine, underground, undisclosed)
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unknown(clandestine, underground, undisclosed)
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unpublished(clandestine, underground, undisclosed)
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unseen(clandestine, underground, undisclosed)
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veiled(clandestine, underground, undisclosed)
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with a lid on(expression, adjective, idiom, sensitive, sub-rosa)
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APASmart Define. (2015). top secret thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/top_secret/thesaurus/synonyms
ChicagoSmart Define. 2015. "top secret thesaurus" https://smartdefine.org/top_secret/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, top secret thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/top_secret/thesaurus/synonyms>.
MLASmart Define. "top secret thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/top_secret/thesaurus/synonyms>