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plot
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sub-rosa
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subterranean
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subterraneous
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ulterior
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under-the-table
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undisclosed
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undiscovered
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unimagined
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unknown
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unrevealed
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unseen
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unthought-of
<12>
11 years ago|26 views|share |citing 
APASmart Define. (2015). cloak-and-dagger thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/cloak-and-dagger/thesaurus/related
ChicagoSmart Define. 2015. "cloak-and-dagger thesaurus" https://smartdefine.org/cloak-and-dagger/thesaurus/related (accessed September 29, 2026).
HarvardSmart Define 2015, cloak-and-dagger thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/cloak-and-dagger/thesaurus/related>.
MLASmart Define. "cloak-and-dagger thesaurus" 14 April 2015. Web. 29 September 2026. <https://smartdefine.org/cloak-and-dagger/thesaurus/related>