Synonyms|130Antonyms|33|Broader|2Narrower|3Related|57
1
themselves
1
under the table(expression, idiom, quietly, secretly, personally)
1
under wraps(expression, adverb, clandestine, secretly, slyly)
1
undercover(adverb, clandestine, secretly, slyly, underhandedly)
1
underground
1
undergroundly
1
unobserved(quietly, secretly, personally, privately, furtively)
1
unobtrusively
1
wildcat(adverb, clandestine, secretly, slyly, underhandedly)
1
without your knowledge
0
hiddenly
0
mystically
0
adulterously
0
alternative
0
backstage
0
behind closed doors
0
behind one's back(adverb, deceitfully)
0
cagily
0
cautiously
0
classified
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APASmart Define. (2015). surreptitiously thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/surreptitiously/thesaurus/synonyms
ChicagoSmart Define. 2015. "surreptitiously thesaurus" https://smartdefine.org/surreptitiously/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, surreptitiously thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/surreptitiously/thesaurus/synonyms>.
MLASmart Define. "surreptitiously thesaurus" 10 April 2015. Web. 28 September 2026. <https://smartdefine.org/surreptitiously/thesaurus/synonyms>