10
secretly(adverb, show, clandestine, secretly, furtively)
9
covertly(noun, adverb, show, quietly, secretly)
7
on the sly(noun, expression, idiom, adverb, show)
7
surreptitiously(noun, adverb, clandestine, quietly, secretly)
6
confidentially(adverb, secretly)
6
furtively(noun, adverb, clandestine, quietly, secretly)
6
stealthily(noun, adverb, clandestine, quietly, secretly)
5
privately(adverb, clandestine, quietly, secretly, personally)
4
sub rosa(adverb, show, clandestine, quietly, secretly)
3
by stealth(expression, idiom, adverb, show, clandestine)
3
in secret(expression, idiom, adverb)
3
on the q.t(noun, adverb)
3
or Q.T.(noun, adverb)
3
quietly(noun, adverb, secretly, personally, privately)
3
slyly(noun, adverb, clandestine, quietly, secretly)
3
sneakily(noun, adverb)
2
clandestine(adjective, adverb, secretly, slyly, underhandedly)
2
hiddenly
2
huggermugger(adverb, show, secretly)
2
in camera(expression, adverb, clandestine, quietly, secretly)
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APASmart Define. (2013). clandestinely thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/clandestinely/thesaurus/synonyms
ChicagoSmart Define. 2013. "clandestinely thesaurus" https://smartdefine.org/clandestinely/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2013, clandestinely thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/clandestinely/thesaurus/synonyms>.
MLASmart Define. "clandestinely thesaurus" 17 June 2013. Web. 20 September 2026. <https://smartdefine.org/clandestinely/thesaurus/synonyms>