15 entries under underhandedly topic. ×

11
furtively(noun, adverb, clandestine, quietly, secretly)
9
secretly(adverb, clandestine, furtively, surreptitiously)
8
stealthily(noun, adverb, clandestine, quietly, secretly)
7
clandestinely(noun, adverb, clandestine, quietly, secretly)
6
surreptitiously(noun, adverb, clandestine, quietly, secretly)
4
privately(adverb, clandestine, quietly, secretly, personally)
2
by stealth(expression, clandestine, quietly, personally, privately)
1
hush-hush(clandestine, quietly, secretly, personally, privately)
1
in camera(expression, clandestine, quietly, personally, privately)
1
sub rosa(expression, adverb, clandestine, quietly, personally)
0
clandestine(secretly, surreptitiously)
0
under cover(expression, clandestine)
0
under wraps(expression, clandestine, secretly, surreptitiously)
0
undercover(clandestine, secretly, surreptitiously)
0
wildcat(clandestine, secretly, surreptitiously)
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APASmart Define. (2015). slyly thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/slyly/thesaurus/synonyms
ChicagoSmart Define. 2015. "slyly thesaurus" https://smartdefine.org/slyly/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, slyly thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/slyly/thesaurus/synonyms>.
MLASmart Define. "slyly thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/slyly/thesaurus/synonyms>