surreptitious (
http://definr.com/surreptitious)
adj 1: marked by quiet and caution and secrecy; taking pains to
avoid being observed; "a furtive manner"; "a lurking
prowler"; "a sneak attack"; "stealthy footsteps"; "a
surreptitious glance at his watch"; "someone skulking
in the shadows" [syn:
furtive,
lurking,
skulking,
sneak(a),
sneaky,
stealthy]
2: conducted with or marked by hidden aims or methods;
"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"
[syn:
clandestine,
cloak-and-dagger,
hole-and-corner(a),
hugger-mugger,
hush-hush,
on the quiet(p),
secret,
undercover,
underground]