16 entries under slyly topic. ×

12
clandestinely(adverb, show, clandestine, furtively)
11
in secret(expression, idiom, adverb, concealment)
6
personally(adverb, closely, privately, confidentially)
5
sub rosa(expression, adverb, show, clandestine)
4
on the quiet(expression, idiom, adverb, clandestine)
3
behind closed doors(expression, idiom, confidentially, surreptitiously)
3
clandestine(adjective, adverb, underhandedly, surreptitiously)
3
in camera(expression, adverb, clandestine, underhandedly)
3
undercover(adjective, adverb, clandestine, underhandedly)
1
hush-hush(adverb, clandestine, underhandedly, surreptitiously)
1
in confidence(expression, idiom, confidentially, surreptitiously)
1
in holes and corners(expression, idiom, adverb, clandestine)
1
on the QT(expression, idiom, adverb, clandestine)
1
under wraps(expression, adverb, clandestine, underhandedly)
1
wildcat(adverb, clandestine, underhandedly, surreptitiously)
0
behind your back(adverb, surreptitiously)
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APASmart Define. (2016). secretly thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/secretly/thesaurus/synonyms
ChicagoSmart Define. 2016. "secretly thesaurus" https://smartdefine.org/secretly/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, secretly thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/secretly/thesaurus/synonyms>.
MLASmart Define. "secretly thesaurus" 19 February 2016. Web. 27 September 2026. <https://smartdefine.org/secretly/thesaurus/synonyms>