secrecy
concealment
silence
secretiveness
concealing
hiding
under wraps
confidentiality
cryptadia
let the cat out of the bag
hush up
secernent
keep a lid on
secret
keep from
secretness
oyster
closet
secretive
keep quiet
keep
darkness
secretomics
on the Q.T.
on the QT
in secret
closehanded
oversecrete
secretly
closeness
closehandedness
pseudosecret
hidness
keep one's lips sealed
sensitive
occulted
confidential
backroom
semisecret
long-tongued
under one's hat
tip one's hand
secretively
make known
something nasty in the woodshed
stall
secretability
subterranean
conceal
cloakedly