behind someone's back
unbeknown
unbeknownst
undisclosedly
occult
off-the-record
on the hush
under the rose
arcane
privily
under the table
unknownly
in secret
concealedly
live a lie
covertly
on the down-low
under the covers
supersecret
semisecret
latently
hugger-mugger
underground
secretly
closehanded
backbiting
something nasty in the woodshed
off the grid
unknowledgeably
unknowing
clammish
secernent
for all one knows
sneaking
give away
self-knowing
have the advantage of someone
semisecretly
close
closemouthed
get wind of
closelipped
semisecrecy
behind the scenes
holocryptic
secretive
tightlipped
undisclosing
sieve
sub rosa
hideling
unsecretly
leak
nonsecret
on the QT
hidelings
on the Q.T.
concealment
underlife
unknowingly
hush up
keep quiet
top secret
espionage
under wraps
clandestinely
stealth
steal
feel around
in petto
knowing
closehandedness
sensitive
encryption
shoot off at the mouth
cryptadia
clandescent
unacquaintedly
secretively
confidence
conceal
underhand
undisclosed
backroom
incognito
whistle in the dark
bring out
break
under the radar
inside
disclose

English words for 'Without somebody's knowledge; secretly.'

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