9 entries under slyly topic. ×

2
clandestine(adverb, secretly, underhandedly)
2
insidiously(adverb, quietly, secretly, personally, privately)
1
intimately(quietly, secretly, personally, privately, furtively)
1
obscurely(quietly, secretly, personally, privately, furtively)
1
privily(adverb, quietly, secretly, personally, privately)
1
under wraps(expression, adverb, clandestine, secretly)
1
undercover(adverb, clandestine, secretly, underhandedly)
1
unobserved(quietly, secretly, personally, privately, furtively)
1
wildcat(adverb, clandestine, secretly, underhandedly)
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APASmart Define. (2015). surreptitiously thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/surreptitiously/thesaurus/synonyms
ChicagoSmart Define. 2015. "surreptitiously thesaurus" https://smartdefine.org/surreptitiously/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2015, surreptitiously thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/surreptitiously/thesaurus/synonyms>.
MLASmart Define. "surreptitiously thesaurus" 10 April 2015. Web. 30 September 2026. <https://smartdefine.org/surreptitiously/thesaurus/synonyms>