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
subterranean
confidentiality
oyster
on the hush
hidness
sensitive
keep from
closehandedness
secretomics
closet
let the cat out of the bag
on the QT
secretly
cloakedly
in secret
make known
on the Q.T.
underwrapped
crypto-
mum
closeness
keep one's lips sealed
covert
secretness
keep quiet
dark
behind the scenes
underhand
something nasty in the woodshed
in petto