Xem thêm: furtive, sneak(a), sneaky, stealthy, clandestine, cloak-and-dagger, hole-and-corner(a), hugger-mugger, hush-hush, secret, undercover, underground
adj.
a furtive manner
a sneak attack
stealthy footsteps
a surreptitious glance at his watch
clandestine intelligence operations
cloak-and-dagger activities behind enemy lines
hole-and-corner intrigue
secret missions
a secret agent
secret sales of arms
surreptitious mobilization of troops
an undercover investigation
underground resistance
