Synonyms|110Antonyms|3|Broader|1Narrower|0Related|37

14 entries under underhandedly topic. ×

6
secretly(adverb, show, clandestine, furtively, slyly)
5
clandestinely(noun, adverb, show, clandestine, quietly)
4
furtively(noun, adverb, clandestine, quietly, secretly)
3
sub rosa(adverb, show, clandestine, quietly, personally)
3
surreptitiously(noun, adverb, clandestine, quietly, secretly)
2
on the QT(expression, adjective, idiom, adverb, secret)
2
privately(adverb, clandestine, quietly, secretly, personally)
2
slyly(noun, adverb, clandestine, quietly, secretly)
2
stealthily(noun, adverb, clandestine, quietly, secretly)
1
clandestine(adjective, adverb, secret, private, hidden)
1
under cover(expression, adjective, adverb, clandestine, recreant)
1
under wraps(expression, adjective, adverb, secret, clandestine)
1
undercover(adjective, adverb, secret, private, hidden)
1
wildcat(adverb, clandestine, secretly, furtively, slyly)
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APASmart Define. (2015). on the sly thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/on_the_sly/thesaurus/synonyms
ChicagoSmart Define. 2015. "on the sly thesaurus" https://smartdefine.org/on_the_sly/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, on the sly thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/on_the_sly/thesaurus/synonyms>.
MLASmart Define. "on the sly thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/on_the_sly/thesaurus/synonyms>