secretively
secretive
cloakedly
semisecret
closeness
darkness
hugger-mugger
on the Q.T.
hidness
secretly
on the QT
in secret
under one's hat
closehandedness
hideling
mum
backroom
antisecrecy
semisecretly
secernent
down low
clandescent
sensitive
furtive
secretiveness
underhand
dark
covertness
hiddenness
semisecrecy
oversecrete
hush-hush
private
hypersecrecy
stealthy
under wraps
sub rosa
close
closelipped
closemouthed
tightlipped
hidingly
keep from
secret
hole-and-corner
closehanded
hypersecretory
behind the scenes
a man's home is his castle
between you and me
hidelings
soap
under the table
secrecy
clandestinely
covert
confidentiality
concealedly
privily
openness
off the grid
pent
cover-up
discreetly
divulgence
divulgement
hypersecrete
unsecrecy
hush up
shoot off at the mouth
nonsecrecy
backstair
concealingly
disembosom
backstage
silence
let the cat out of the bag
on the down-low
under the covers
concealing
deep
hiding
ultrasecret
concealment
purdah
tabooism
masked
exposure
hide-all