undercover
covert
concealedly
clandestinely
behind the scenes
intriguing
secretly
hole-and-corner
off-the-record
covertly
clandestine
hidelings
off the grid
under the rose
divulgement
on the hush
divulgence
hidingly
under-the-table
back street
secretolytically
behind-the-scenes
secret
sub-rosa
secretively
trick
blow the lid off
semisecretly
underplot
scheming
intrigue
obreptitious
affair
liaison
affaire
intimacy
steal
sub rosa
involvement
amour
let something slip
under the covers
hugger-mugger
actual
on the down-low
infiltration
make known
tailing
dark
shadowing
hoodwinkery
keep from
backstair
in secret
anonymization
on the Q.T.
confidentially
latitancy
stitch-up
cloakedly
disclosed
on the QT
confidentiality
underhand
reconcealment
revelation
stakeout
closehanded
concealment
feigningly
subterraneous
latently
ulterior
subterranean
furtive
down low
surreptitiously
undisclosedly
cover-up
underground
between you and me
air one's dirty laundry in public
hiddenly
confidential
pseudosecret
sensitive
tampering
disembosom
case
let slip
zeugmatic
meddling
lift the lid
jugglery
undercover
covert
intriguing
hole-and-corner
clandestine
under-the-table
behind-the-scenes
sub-rosa
trick
obreptitious
actual
dark
backstair
sub rosa
disclosed
underhand
closehanded
subterraneous
ulterior
subterranean
furtive
down low
confidential
sensitive
zeugmatic
concealedly
clandestinely
secretly
off-the-record
covertly
hidelings
off the grid
under the rose
hidingly
secretolytically
secretively
semisecretly
sub rosa
in secret
on the Q.T.
confidentially
cloakedly
on the QT
feigningly
latently
surreptitiously
undisclosedly
underground
hiddenly
divulgement
divulgence
back street
underplot
scheming
intrigue
affair
liaison
affaire
intimacy
involvement
amour
infiltration
tailing
shadowing
hoodwinkery
anonymization
latitancy
stitch-up
confidentiality
reconcealment
revelation
stakeout
concealment
cover-up
pseudosecret
tampering
case
meddling
jugglery
secret
blow the lid off
steal
let something slip
hugger-mugger
make known
keep from
air one's dirty laundry in public
disembosom
let slip
lift the lid
English words for 'Performed or happening in secret.'
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