Synonyms|130Antonyms|33|Broader|2Narrower|3Related|57
2
incalculable
2
incognito
2
insidiously(adverb, quietly, secretly, personally, privately)
2
latently
2
mysterious
2
on the quiet(expression, idiom, adverb, clandestine, quietly)
2
private
2
scene
2
underhandly
1
behind the scenes(expression, idiom, adverb, unobtrusively)
1
by stealth(expression, adverb, clandestine, quietly, personally)
1
confidential
1
covert
1
esoterically
1
factitiously
1
fictitiously
1
fraudulently
1
furtive
1
guilefully
1
hugger-mugger
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ChicagoSmart Define. 2015. "surreptitiously thesaurus" https://smartdefine.org/surreptitiously/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, surreptitiously thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/surreptitiously/thesaurus/synonyms>.
MLASmart Define. "surreptitiously thesaurus" 10 April 2015. Web. 27 September 2026. <https://smartdefine.org/surreptitiously/thesaurus/synonyms>