superarcane
confidentially
semisecret
confidentialised
confidentiality
in secret
on the QT
on the Q.T.
semisecretly
secretly
under one's hat
clandescent
furtive
sub rosa
stealth
inside information
details
underhand
blabbermouthed
hidelings
talebearing
cloakedly
tattling
leaky
leak
hugger-mugger
covert
steal
public domain
nonconfidential
whisper
secretively
hidingly
under the table
off the grid
listen in
disembosom
darkness
leaker
semisecrecy
openness
get wind of
skinny
hole-and-corner
privily
secernent
private
dark
keep one's mouth shut
mum
shut one's mouth
keep quiet
hypersecrecy
a man's home is his castle
esoteric
sanctum sanctorum
sanctum
uncandid
news leak
tip off
give away
tip
transpire
hideling
closehandedness
keep
espionage
closelipped
closemouthed
sensitive
close
abscond
confidentialness
secretive
tightlipped
down low
squealer
informer
rat
secretness
backroom
betrayer
surreptitiously
blabber
doc drop
deprivatize
unconfidential
purdah
keep one's lips sealed
tell tales out of school
blag

English words for 'Beyond merely arcane; truly confidential.'

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