Synonyms|110Antonyms|3|Broader|1Narrower|0Related|37
1
smoothly
1
sneakily
1
sneaking(adjective, secret, private, hidden, fraudulent)
1
sub-rosa(adjective, secret, private, hidden, covert)
1
under-the-table(adjective, secret, private, hidden, sneaky)
1
under cover(expression, adjective, adverb, clandestine, recreant)
1
under the table(expression, adverb, fraudulent, recreant, quietly)
1
under wraps(expression, adjective, adverb, secret, clandestine)
1
undercover(adjective, adverb, secret, private, hidden)
1
underground(adjective, unusual, secret, radical, secretive)
1
underhandedly(noun, adverb, clandestine, quietly, secretly)
1
unobserved(adverb, quietly, secretly, personally, privately)
1
wildcat(adverb, clandestine, secretly, furtively, slyly)
0
avant garde(expression, secret, subversive)
0
background
0
backstage
0
bated
0
behind closed doors
0
cloak
0
closed
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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>