dishonorable
dishonourable
amoral
conscienceless
corrupt
corrupted
criminal
crooked
dark
devious
dishonest
dissolute
doubtful
dubious
evasive
felonious
fishy
fraudulent
ill-got
ill-gotten
immoral
indirect
insidious
lawless
licentious
mercenary
not kosher
profligate
questionable
rascally
reprobate
roguish
rotten
scampish
shady
shameless
shifty
sinister
slippery
stick-at-nothing
suspicious
thievish
tricky
unconscienced
unconscientious
unconscionable
principle
principled
bloodthirsty
crafty
deceitful
deprave
despicable
heartless
hypocritical
insolent
irresponsible
perfidious
rapacious
selfish
tyrannical
unscrupulous
vindictive
conscientious
scrupulous
upright