betrayal
deceit
dirty pool
dirty trick
dirty work
disloyalty
double-dealing
duplicity
faithlessness
falseheartedness
falseness
falsity
foul play
hypocrisy
infidelity
insidiousness
perfidiousness
sellout
traitorousness
treacherousness
treachery
treason
unfaithfulness
perfidious
perfidiously
avarice
barbarity
depravity
dishonesty
disobedience
dissimulation
falsehood
ingratitude
insincerity
meanness
perjury
profligacy
rapacity
villany
wickedness