62 entries under hidden topic. ×

3
mystical(strange, secret, unknown, curious)
2
close(quiet, secret, reticent, taciturn)
2
clouded(secret, unknown, concealed, unseen)
2
guarded(cover, obscure, dark, secret)
2
incognito(adjective, secret, clandestine, underhanded)
2
sequestered(close, quiet, private, unknown)
2
slinking(secret, private, sneaky, secretive)
2
sub-rosa(secret, private, spy, clandestine)
2
subterranean(adjective, underground)
2
underneath(secret, spy)
2
unexpressed(adjective, cover, obscure, dark)
2
unseen(adjective, secret, unknown, imperceptible)
1
fraudulent(dishonest, deceitful, secret, private)
1
hermetic(close, quiet, private, unknown)
1
implied(adjective, cover, obscure, dark)
1
on the sly(expression, idiom, secret, private)
1
tucked away(expression, close, quiet, secret)
0
creep(secret, spy)
0
intelligence(secret, spy)
0
spy
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APASmart Define. (2015). covert thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/covert/thesaurus/synonyms
ChicagoSmart Define. 2015. "covert thesaurus" https://smartdefine.org/covert/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, covert thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/covert/thesaurus/synonyms>.
MLASmart Define. "covert thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/covert/thesaurus/synonyms>