18
furtively(adverb, close, hideaway, arcane, stealth)
16
covertly(adverb, close, show, hideaway, arcane)
16
stealthily(adverb, close, hideaway, arcane, stealth)
16
surreptitiously(adverb, close, hideaway, arcane, stealth)
14
privately(adverb, close, hideaway, arcane, stealth)
12
clandestinely(adverb, show, clandestine, furtively, slyly)
11
in secret(expression, idiom, adverb, concealment, slyly)
9
confidentially
9
slyly(adverb, clandestine, furtively, underhandedly, surreptitiously)
8
on the sly(expression, idiom, adverb, show, clandestine)
7
quietly(adverb, privately)
7
underhandedly(adverb, close, hideaway, arcane, stealth)
6
incognito(adverb, close, hideaway, arcane, stealth)
6
intimately(adverb, privately)
6
personally(adverb, closely, privately, slyly, confidentially)
5
by stealth(expression, idiom, adverb, show, clandestine)
5
in private(expression, idiom, concealment, confidentially)
5
latently(adverb, close, hideaway, arcane, stealth)
5
secretively(adverb, close, hideaway, arcane, stealth)
5
sub rosa(expression, adverb, show, clandestine, slyly)
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APASmart Define. (2016). secretly thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/secretly/thesaurus/synonyms
ChicagoSmart Define. 2016. "secretly thesaurus" https://smartdefine.org/secretly/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, secretly thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/secretly/thesaurus/synonyms>.
MLASmart Define. "secretly thesaurus" 19 February 2016. Web. 21 September 2026. <https://smartdefine.org/secretly/thesaurus/synonyms>