94 entries under hidden topic. ×

1
undiscovered(strange, new, remote, mysterious)
1
unidentified(adjective, strange, new, remote, mysterious)
1
unobtrusive(quiet, plain, imperceptible, discreet)
1
vital(adjective, original, basic, fundamental)
0
creep(secret, spy, covert)
0
Delphian(adjective, evil, deep, mysterious)
0
anagogic(adjective, evil, deep, mysterious)
0
artful
0
bottom(adjective, original, basic, fundamental)
0
bottom-line(adjective, original, basic, fundamental)
0
cloak-and-dagger
0
cloak and dagger(expression, idiom, fraudulent)
0
critical(adjective, original, basic, fundamental)
0
crucial(adjective, original, basic, fundamental)
0
foxy
0
hidden from sight(expression, adjective, idiom, secret)
0
hidden from view(expression, adjective, idiom, secret)
0
hole-and-corner(secret, spy, covert)
0
illegitimate
0
illicit
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APASmart Define. (2015). concealed thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/concealed/thesaurus/synonyms
ChicagoSmart Define. 2015. "concealed thesaurus" https://smartdefine.org/concealed/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, concealed thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/concealed/thesaurus/synonyms>.
MLASmart Define. "concealed thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/concealed/thesaurus/synonyms>