clandestinity
clandestineness
backstair
confidentialness
hole-and-corner
unauthorizedness
stealthy
discreetness
hidelings
a man's home is his castle
covertness
steal
hideling
surreptition
off the grid
spookspeak
clandescent
public domain
hugger-mugger
confidentiality
traitorhood
closet
traitorousness
on the Q.T.
underhand
secretively
unenclosedness
stealthiness
invader
semisecret
subversiveness
covert
pent
furtive
stealth
hushedness
confidentially
covertism
hidingly
under one's hat
secretness
lurkingness
hiddenness
under wraps
disclarity
black operation
secureness
hackability
in secret
on the QT