25 entries under underhanded topic. ×

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furtive(secret, hidden, clandestine, underground)
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sub rosa(expression, secret, clandestine, underground)
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under-the-table(secret, hidden, clandestine, underground)
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underhand(secret, hidden, clandestine, underground)
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unsuspected(secret, hidden, clandestine, underground)
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APASmart Define. (2016). buried thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/buried/thesaurus/synonyms
ChicagoSmart Define. 2016. "buried thesaurus" https://smartdefine.org/buried/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, buried thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/buried/thesaurus/synonyms>.
MLASmart Define. "buried thesaurus" 3 April 2016. Web. 27 September 2026. <https://smartdefine.org/buried/thesaurus/synonyms>