secretive
secretively
hugger-mugger
closehandedness
hidness
darkness
mum
semisecret
on the QT
in secret
on the Q.T.
secretly
closeness
hypersecrecy
semisecrecy
cloakedly
closemouthed
close
closelipped
tightlipped
hideling
antisecrecy
openness
furtive
secernent
under one's hat
down low
clandescent
nonsecrecy
unsecrecy
backroom
stealthy
private
underhand
keep from
transpire
confidentiality
hypersecretory
semisecretly
covertness
keep quiet
backstage
under wraps
secrecy
hush-hush
secretiveness
hiddenness
keep one's mouth shut
shut one's mouth
a man's home is his castle
closehanded
subterranean
under the table
disembosom
secret
keep a lid on
let the cat out of the bag
sensitive
hypersecrete
stealthiness
classify
deep
oversecrete
secretness
stall
privily
between you and me
soap
shoot off at the mouth
hush up
conceal
hypersecretion
silence
cover-up
occulted
concealing
tabooism
blue wall of silence
concealment
discreet
hiding
behind the scenes
discreetness
hidingly
cryptadia
spying