concealed
covert
artful
back-door
backstairs
calculating
chiseling
clandestine
collusive
covinous
crafty
cunning
deceitful
doggo
false
falsehearted
feline
finagling
fraudulent
furtive
guileful
hidden
hidden out
hidlings
hole-and-corner
hugger-mugger
hush-hush
in ambush
in hiding
in the wings
indirect
insidious
lurking
on the sly
on tiptoe
private
privy
prowling
pussyfoot
pussyfooted
quiet
scheming
secret
secretive
sharp
shifty
backward
cautionary
congratulatory
conspiratorial
convulsive
cursory
deprecatory
hasty
illicit
nightly
oblique
periodic
playful
roguish
sideways
sidewise
sly
sneaky
wry
Delicious
ambitious
auspicious
capricious
delicious
expeditious
factitious
fictitious
injudicious
judicious
malicious
nutritious
pernicious
propitious
repetitious
seditious
superstitious
suspicious
vicious