surreptitious

equivalents

concealed

covert

synonyms

artful

back-door

backstairs

calculating

chiseling

clandestine

clandestine

collusive

concealed

covert

covert

covinous

crafty

cunning

deceitful

doggo

false

falsehearted

feline

finagling

fraudulent

furtive

guileful

hidden

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

secret

secretive

sharp

shifty

same-contexts

backward

cautionary

clandestine

congratulatory

conspiratorial

convulsive

covert

cursory

deprecatory

furtive

hasty

illicit

nightly

oblique

periodic

playful

roguish

sideways

sidewise

sly

sneaky

wry

rhymes

Delicious

ambitious

auspicious

capricious

delicious

expeditious

factitious

fictitious

injudicious

judicious

malicious

nutritious

pernicious

propitious

repetitious

seditious

superstitious

suspicious

vicious