on the hush
off-the-record
on the down-low
under the covers
secretly
closehanded
under the rose
hugger-mugger
underground
subterranean
in petto
under the table
sub rosa
in secret
concealedly
mum
latently
crypto-
covertly
close-tiled
privily
secernent
occulted
under wraps
clandestinely
underwrapped
undisclosedly
keep a lid on
unrevealed
behind the scenes
confidentiality
darkness
cloakedly
off the grid
hidelings
cryptadia
closehandedness
underhand
make known
clandescent
undisclosed
backstage
on the QT
on the Q.T.
secret
under one's hat
secretively
pseudosecret
concealment
secret of Polichinelle
ultrasecret
hole-and-corner
nonsecret
confide
semisecrecy
private
let the cat out of the bag
semisecretive
semisecretly
underhanded
down low
secretable
dark
confidentially
hidingly
stall
covert
closeness
hidness
something nasty in the woodshed
supersecret
exposure
concealing
shoot off at the mouth
out
top secret
hiding
closet
semisecret
collogue
behind someone's back
hush-hush
sensitive
oversecrete
on a need-to-know basis

English words for 'Secretly; in secret.'

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