Synonyms|244Antonyms|28|Broader|1Narrower|0Related|54

58 entries under underground topic. ×

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restricted(clandestine, undisclosed)
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sly(clandestine, undisclosed)
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sneak(clandestine, undisclosed)
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sneaky(clandestine, undisclosed)
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stealthy(clandestine, undisclosed)
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sub-rosa(clandestine, undisclosed)
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surreptitious(clandestine, undisclosed)
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top-secret(clandestine, undisclosed)
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top secret(expression, clandestine, undisclosed)
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unacknowledged(clandestine, undisclosed)
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under-the-table(clandestine, undisclosed)
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under false pretense(expression, idiom, clandestine, undisclosed)
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under wraps(expression, clandestine, undisclosed)
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undercover(clandestine, undisclosed)
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underhand(clandestine, undisclosed)
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underhanded(clandestine, undisclosed)
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undisclosed(obscure, unknown, clandestine, unrevealed)
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unrevealed(obscure, unknown, clandestine, undisclosed)
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APASmart Define. (2015). enigmatical thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/enigmatical/thesaurus/synonyms
ChicagoSmart Define. 2015. "enigmatical thesaurus" https://smartdefine.org/enigmatical/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, enigmatical thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/enigmatical/thesaurus/synonyms>.
MLASmart Define. "enigmatical thesaurus" 13 April 2015. Web. 28 September 2026. <https://smartdefine.org/enigmatical/thesaurus/synonyms>