dark
off-the-record
top secret
mum
crypto-
secretomics
ultrasecret
secretomal
top-secret
supersecret
secernent
hypersecrecy
nonsecret
keep a lid on
occulted
cryptadia
pseudosecret
underhand
exposure
subterranean
under wraps
clandescent
hiding
concealment
closehanded
concealing
something nasty in the woodshed
closehandedness
secretiveness
secret of Polichinelle
secrecy
tip one's hand
silence
covert
secretional
occult
secretionary
under the covers
on the down-low
semisecrecy
secretive
open secret
backstage
semisecret
make known
on the hush
air one's dirty laundry in public
hidness
divulgation
sub rosa
hugger-mugger
oversecrete
sing like a bird
hypersecretion
spill the beans
out
secret
shadow history
darkness
hiddenmost
nonsecretable
shoot off at the mouth
hypersecretory
underwrapped
reveal
bring out
let on
let out
incretion
break
discover
peach
babble
talk
secretolysis
uncover
unwrap
under one's hat
asecretion
let the cat out of the bag
babble out
ectocrine
give away
backroom
keep from
blab out
blab
disclose
sing
divulge
tattle
masked
hideling
expose