hush-hush
adj 1: 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}, {secret},
{surreptitious}, {undercover}, {underground}]