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6
secretly(adverb, clandestine, furtively, slyly)
5
clandestinely(noun, adverb, clandestine, quietly)
4
covertly(noun, adverb, quietly, secretly)
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sub rosa(adverb, clandestine, quietly, personally)
0
huggermugger
11 years ago|1.6k views|share |citing 
APASmart Define. (2015). on the sly thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/on_the_sly/thesaurus/synonyms
ChicagoSmart Define. 2015. "on the sly thesaurus" https://smartdefine.org/on_the_sly/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, on the sly thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/on_the_sly/thesaurus/synonyms>.
MLASmart Define. "on the sly thesaurus" 14 April 2015. Web. 29 September 2026. <https://smartdefine.org/on_the_sly/thesaurus/synonyms>