backstage
darkness
closehanded
semisecrecy
hidness
subterranean
behind the scenes
under wraps
occulted
under one's hat
hypersecrecy
hugger-mugger
down low
masked
mum
closehandedness
hush-hush
secernent
in secret
on the hush
secretly
on the Q.T.
on the QT
a man's home is his castle
clandescent
on the down-low
obvelation
under the covers
cloakedly
semisecret
confidentiality
in petto
hiding
buried
off-the-record
closet
covertness
covert
closeness
hiddenness
concealedly
cover-up
cryptadia
underhand
secret
under the table
private
hiddle
secretive
conceal
concealing
hypersecretory
secretively
sensitive
concealment
lean
keep a lid on
pent
secrete
secrecy
offstage
backroom
keep from
confidential
air one's dirty laundry in public
confidence
on a need-to-know basis
hideling
hole-and-corner
cat in the meal-tub
purdah
lie low
industrial espionage
sub rosa
hush up
deprivatize
crypto-
dark
under the rose
exposure
underwrapped
ultrasecret
veiled
hypersecretion
stall
semisecretive
delitescency
doc drop