5
surreptitiously(noun, adverb)
4
furtively(noun, adverb, secretly, slyly, surreptitiously)
4
insidiously(adjective, adverb, secretly, slyly, surreptitiously)
4
slyly(noun, adverb, secretly, furtively, deceitfully)
3
clandestinely(noun, adverb)
3
cleverly
3
craftily(adverb, deceitfully)
3
deviously
3
secretly(adverb, furtively, slyly, surreptitiously)
3
shiftily
3
stealthily(noun, adverb, secretly, furtively, slyly)
2
astutely
2
back
2
covertly(noun, adverb)
2
deceitfully
2
meanly
2
private
2
underhandly
1
archly
1
basely
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APASmart Define. (2015). sneakily thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/sneakily/thesaurus/synonyms
ChicagoSmart Define. 2015. "sneakily thesaurus" https://smartdefine.org/sneakily/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, sneakily thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/sneakily/thesaurus/synonyms>.
MLASmart Define. "sneakily thesaurus" 13 April 2015. Web. 21 September 2026. <https://smartdefine.org/sneakily/thesaurus/synonyms>