1
in strict confidence(expression, idiom, quietly, secretly, personally)
1
indirectly
1
intimately(quietly, secretly, personally, privately, slyly)
1
obscurely(quietly, secretly, personally, privately, slyly)
1
occultly
1
on the QT(expression, idiom, clandestine, quietly, secretly)
1
on the quiet(expression, idiom, clandestine, quietly, personally)
1
shiftily
1
silently
1
sly
1
sneakingly
1
stealth
1
thievishly
1
under the table(expression, idiom, quietly, secretly, personally)
1
under wraps(expression, clandestine, secretly, slyly, underhandedly)
1
undercover(clandestine, secretly, slyly, underhandedly, incognito)
1
underground
1
underhand
1
unobserved(quietly, secretly, personally, privately, slyly)
1
wildcat(clandestine, secretly, slyly, underhandedly, surreptitiously)
11 years ago|4k views|share |citing 
APASmart Define. (2015). furtively thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/furtively/thesaurus/synonyms
ChicagoSmart Define. 2015. "furtively thesaurus" https://smartdefine.org/furtively/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, furtively thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/furtively/thesaurus/synonyms>.
MLASmart Define. "furtively thesaurus" 13 April 2015. Web. 29 September 2026. <https://smartdefine.org/furtively/thesaurus/synonyms>