concealment
secrecy
cryptadia
under wraps
secernent
concealing
hiding
keep a lid on
darkness
secret
secretiveness
silence
occulted
hush up
closehanded
stall
pseudosecret
on the down-low
under the covers
under one's hat
confidentiality
subterranean
oyster
hidness
sensitive
on the hush
closehandedness
keep from
let the cat out of the bag
secretomics
closet
make known
on the Q.T.
cloakedly
secretly
in secret
on the QT
underwrapped
mum
closeness
crypto-
keep one's lips sealed
secretness
covert
something nasty in the woodshed
behind the scenes
in petto
dark
off-the-record
keep quiet