corrupt
crooked
amoral
artful
back-door
backstairs
calculating
chiseling
clandestine
collusive
conscienceless
corrupted
covert
covinous
crafty
criminal
cunning
dark
deceitful
devious
dishonest
dishonorable
doubtful
dubious
duplicitous
evasive
false
falsehearted
feline
felonious
finagling
fishy
fraudulent
furtive
guileful
hidden
hidlings
hole-and-corner
hugger-mugger
ill-got
ill-gotten
immoral
indirect
insidious
not kosher
privy
questionable
quiet
Machiavellian
dastardly
despicable
discreditable
disingenuous
diversionary
knavish
manipulative
nefarious
perfidious
self-serving
shifty
sneaky
treasonable
underhand
unethical
banded
branded
candid
commanded
demanded
disbanded
evenhanded
expanded
handed
landed
lefthanded
red-handed
remanded
righthanded
sanded
single-handed
stranded
unbranded