20 entries under spy topic. ×

9
clandestine(adjective, secret, private, hidden)
9
surreptitious(adjective, secret, hidden, sneaky)
8
undercover(adjective, secret, private, hidden)
7
secret(adjective, private, hidden, sneaky)
6
hush-hush(adjective, secret, private, hidden)
6
underground(adjective, secret, hidden, covert)
4
covert(adjective, secret, private, hidden)
2
hidden(adjective, secret, private, sneaky)
2
stealth(adjective, secret, hidden, covert)
2
underneath(adjective, secret, hidden, covert)
1
on the QT(expression, adjective, idiom, secret, private)
1
private(adjective, secret, hidden, sneaky)
1
sub-rosa(adjective, secret, private, hidden)
1
underhand(adjective, secret, private, hidden)
0
concealed(adjective, secret, hidden, covert)
0
confidential(adjective, secret, hidden, covert)
0
creep(adjective, secret, hidden, covert)
0
incognito(adjective, secret, hidden, covert)
0
intelligence(adjective, secret, hidden, covert)
0
under cover(expression, adjective, secret, covert)
11 years ago|1.5k views|share |citing 
APASmart Define. (2015). hole-and-corner thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/hole-and-corner/thesaurus/synonyms
ChicagoSmart Define. 2015. "hole-and-corner thesaurus" https://smartdefine.org/hole-and-corner/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2015, hole-and-corner thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/hole-and-corner/thesaurus/synonyms>.
MLASmart Define. "hole-and-corner thesaurus" 13 April 2015. Web. 30 September 2026. <https://smartdefine.org/hole-and-corner/thesaurus/synonyms>