Synonyms|196Antonyms|18|Broader|2Narrower|0Related|63
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covered(clandestine, underground, undisclosed)
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cretinous(unknowing, hermetical, unbriefed)
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deep(clandestine, underground, undisclosed)
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design
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device
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diagram
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diplomacy
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enigmatical(clandestine, underground, undisclosed)
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esoteric(clandestine, underground, undisclosed)
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for eyes only(expression, idiom, sensitive, sub-rosa)
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frame-up
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graph
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guarded(mysterious, private, reticent)
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hermetical(unknowing, unbriefed)
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hid
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hidden away(expression, sensitive, sub-rosa)
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hot-headed(unknowing, hermetical, unbriefed)
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huggermugger(adjective, secret)
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ignorant(unknowing, hermetical, unbriefed)
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imperceivable(unknowing, hermetical, unbriefed)
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APASmart Define. (2015). backstairs thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/backstairs/thesaurus/synonyms
ChicagoSmart Define. 2015. "backstairs thesaurus" https://smartdefine.org/backstairs/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, backstairs thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/backstairs/thesaurus/synonyms>.
MLASmart Define. "backstairs thesaurus" 13 April 2015. Web. 23 September 2026. <https://smartdefine.org/backstairs/thesaurus/synonyms>