20 entries under underhanded topic. ×

16
concealed(adjective, strange, disguise, secret, hidden)
14
disguised(adjective, adverb, disguise, secret, hidden)
8
camouflaged(adjective, close, disguise, secret, hidden)
6
hidden(verb, adjective, strange, disguise, secret)
3
covert(adjective, secret, hidden, clandestine)
3
private(adjective, secret, hidden, spy, clandestine)
2
clandestine(secret, hidden, spy, underground, undisclosed)
2
furtive(adjective, close, secret, hidden, spy)
2
undercover(adjective, adverb, informal, secret, hidden)
1
buried(secret, hidden, underground, covered)
1
dissembled(close, secret, restricted, hidden, clandestine)
1
hush-hush(secret, hidden, clandestine, covered)
1
obscured(secret, hidden, clandestine, underground)
1
shrouded(secret, hidden, clandestine, underground)
1
stealthy(secret, hidden, spy, clandestine, underground)
1
surreptitious(secret, hidden, spy, clandestine, underground)
1
under-the-table(secret, hidden, clandestine, underground, undisclosed)
1
under wraps(expression, secret, hidden, clandestine)
1
underhand(secret, hidden, spy, clandestine, underground)
1
veiled(secret, hidden, clandestine, underground)
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APASmart Define. (2015). incognito thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/incognito/thesaurus/synonyms
ChicagoSmart Define. 2015. "incognito thesaurus" https://smartdefine.org/incognito/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, incognito thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/incognito/thesaurus/synonyms>.
MLASmart Define. "incognito thesaurus" 10 April 2015. Web. 28 September 2026. <https://smartdefine.org/incognito/thesaurus/synonyms>