Synonyms|270Antonyms|4|Broader|0Narrower|0Related|30

68 entries under underground topic. ×

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occult(obscure, unknown, clandestine, undisclosed)
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on the QT(expression, idiom, obscure, unknown, clandestine)
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recondite(obscure, unknown, clandestine, undisclosed)
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restricted(clandestine, undisclosed)
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secretive(clandestine, undisclosed)
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shrouded(obscure, unknown, 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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strange(obscure, deep, unknown, clandestine)
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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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APASmart Define. (2015). unfrequented thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/unfrequented/thesaurus/synonyms
ChicagoSmart Define. 2015. "unfrequented thesaurus" https://smartdefine.org/unfrequented/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, unfrequented thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/unfrequented/thesaurus/synonyms>.
MLASmart Define. "unfrequented thesaurus" 14 April 2015. Web. 27 September 2026. <https://smartdefine.org/unfrequented/thesaurus/synonyms>