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

53 entries under underground topic. ×

2
mystical(adjective, secret, unknown, hidden)
2
on the QT(expression, adjective, idiom, adverb, dishonest)
2
recondite(secret, unknown, hidden, concealed)
2
sneak(clandestine, undisclosed, skulking)
2
sub-rosa(adjective, dishonest, cunning, deceitful, secret)
2
unknown(secret, hidden, clandestine, concealed)
1
conspiratorial(clandestine, undisclosed, sneaky, covert)
1
deep(adjective, clandestine, undisclosed)
1
dissembled(secret, hidden, clandestine, undisclosed)
1
reticent(mysterious, private, taciturn, clandestine)
1
undisclosed(secret, unknown, hidden, concealed)
1
unseen(secret, unknown, hidden, concealed)
0
ambiguous(clandestine, undisclosed)
0
arcane(clandestine, undisclosed)
0
backdoor(clandestine, undisclosed)
0
classified(adjective, secret, clandestine, undisclosed)
0
discreet(clandestine, undisclosed)
0
dissimulated(clandestine, undisclosed)
0
enigmatical(clandestine, undisclosed)
0
inside(clandestine, undisclosed)
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APASmart Define. (2015). undercover thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/undercover/thesaurus/synonyms
ChicagoSmart Define. 2015. "undercover thesaurus" https://smartdefine.org/undercover/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, undercover thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/undercover/thesaurus/synonyms>.
MLASmart Define. "undercover thesaurus" 13 April 2015. Web. 26 September 2026. <https://smartdefine.org/undercover/thesaurus/synonyms>