Synonyms|143Antonyms|35|Broader|0Narrower|0Related|115

66 entries under underground topic. ×

1
inside(close, clandestine, undisclosed, furtive)
1
private(clandestine, undisclosed)
1
secluded(adjective, clandestine, undisclosed)
1
secretive(clandestine, undisclosed)
1
sly(clandestine, undisclosed)
1
sneak(close, inside, clandestine, undisclosed)
1
sneaky(clandestine, undisclosed)
1
stealthy(clandestine, undisclosed)
1
strange(clandestine, undisclosed)
1
sub-rosa(close, sensitive, clandestine, undisclosed)
1
surreptitious(adjective, clandestine, undisclosed)
1
top secret(expression, close, sensitive, inside, clandestine)
1
under-the-table(sensitive, clandestine, undisclosed, sub-rosa)
1
underhanded(clandestine, undisclosed)
1
undisclosed(unknown, clandestine, nameless)
0
abstruse(clandestine, undisclosed)
0
ambiguous(clandestine, undisclosed)
0
arcane(clandestine, undisclosed)
0
cloak-and-dagger(clandestine, undisclosed)
0
closet(clandestine, undisclosed)
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APASmart Define. (2015). unacknowledged thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/unacknowledged/thesaurus/synonyms
ChicagoSmart Define. 2015. "unacknowledged thesaurus" https://smartdefine.org/unacknowledged/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, unacknowledged thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/unacknowledged/thesaurus/synonyms>.
MLASmart Define. "unacknowledged thesaurus" 14 April 2015. Web. 27 September 2026. <https://smartdefine.org/unacknowledged/thesaurus/synonyms>