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

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

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