Synonyms|410Antonyms|71|Broader|1Narrower|7Related|371

53 entries under underground topic. ×

13
clandestine(adjective, adverb, show, dishonest, secret)
13
secret(adjective, quiet, show, dishonest, hidden)
8
hidden(adjective, secret, spy, clandestine)
7
confidential(adjective, secret, hidden, spy, clandestine)
7
private(adjective, secret, unknown, hidden, spy)
6
covertly(adverb, secretly, furtively, slyly)
6
secretly(adverb, clandestine, slyly, underhandedly)
6
secluded(adjective, secret, unknown, hidden)
5
cloak-and-dagger(adjective, show, full, secret, sly)
5
privately(adverb, clandestine, secretly, slyly)
4
occult(secret, unknown, hidden, concealed)
3
clouded(secret, unknown, hidden, concealed)
3
furtively(adverb, clandestine, secretly, slyly)
3
sub rosa(expression, adjective, idiom, show, secret)
3
mystic(adjective, secret, unknown, hidden)
3
obscured(adjective, secret, hidden, concealed)
2
esoteric(secret, unknown, hidden, concealed)
2
in ambush(expression, idiom, clandestine, undisclosed)
2
abstruse(secret, unknown, hidden, concealed)
2
closet(noun, adjective, secret, sly, clandestine)
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APASmart Define. (2015). undercover thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/undercover/thesaurus/synonyms
ChicagoSmart Define. 2015. "undercover thesaurus" https://smartdefine.org/undercover/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, undercover thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/undercover/thesaurus/synonyms>.
MLASmart Define. "undercover thesaurus" 13 April 2015. Web. 24 September 2026. <https://smartdefine.org/undercover/thesaurus/synonyms>