19
secretly(adverb, close, hideaway, arcane, stealth)
13
furtively(noun, adverb, close, hideaway, arcane)
13
privately(adverb, close, hideaway, arcane, stealth)
12
stealthily(noun, adverb, close, hideaway, arcane)
11
covertly(noun, adverb, close, hideaway, arcane)
8
on the sly(noun, expression, idiom, adverb, clandestine)
8
underhandedly(noun, adverb, close, hideaway, arcane)
7
sneakily(noun, adverb)
6
clandestinely(noun, adverb, clandestine, quietly, secretly)
6
secretively(adverb, close, hideaway, arcane, stealth)
5
confidentially
5
slyly(noun, adverb, clandestine, quietly, secretly)
3
sub rosa(expression, adverb, clandestine, quietly, personally)
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
secret
2
back
2
clandestine(adverb, secretly, slyly, underhandedly)
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APASmart Define. (2015). surreptitiously thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/surreptitiously/thesaurus/synonyms
ChicagoSmart Define. 2015. "surreptitiously thesaurus" https://smartdefine.org/surreptitiously/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, surreptitiously thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/surreptitiously/thesaurus/synonyms>.
MLASmart Define. "surreptitiously thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/surreptitiously/thesaurus/synonyms>