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15
secretly(adverb, close, hideaway, arcane)
10
clandestinely(noun, adverb, quietly, secretly)
7
sub rosa(expression, adverb, quietly, secretly)
5
on the sly(noun, idiom, adverb, quietly)
3
huggermugger(adverb, secretly)
1
by stealth(expression, idiom, adverb, quietly)
1
under cover(expression, idiom, adverb, furtively)
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APASmart Define. (2015). covertly thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/covertly/thesaurus/synonyms
ChicagoSmart Define. 2015. "covertly thesaurus" https://smartdefine.org/covertly/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, covertly thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/covertly/thesaurus/synonyms>.
MLASmart Define. "covertly thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/covertly/thesaurus/synonyms>