2
under cover(expression, adjective, obscure, dark, isolated)
2
undercover(adjective, obscure, secret, unknown, hidden)
2
underground(adjective, obscure, secret, unknown, hidden)
2
underhand(adjective, clandestine, underground, undisclosed)
2
undetectable
2
unheard
2
unheard-of(adjective, strange, new, remote, indefinite)
2
unknowable(adjective, obscure, dark, superior, supernatural)
2
unnamed(adjective, strange, secret, indefinite, unidentified)
2
unnatural(adjective, obscure, dark, superior, mysterious)
2
unnoted(adjective, strange, new, remote, isolated)
2
unobservable(adjective, latent)
2
unplumbed
2
unrecognized(adjective, strange, new, remote, mysterious)
2
unsolved
2
unspied
2
unspoken
2
unsuspected
2
untraced
1
QT(adjective, secret, unknown, isolated, hidden)
11 years ago|2.1k views|share |citing 
APASmart Define. (2015). unrevealed thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/unrevealed/thesaurus/synonyms
ChicagoSmart Define. 2015. "unrevealed thesaurus" https://smartdefine.org/unrevealed/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, unrevealed thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/unrevealed/thesaurus/synonyms>.
MLASmart Define. "unrevealed thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/unrevealed/thesaurus/synonyms>