disloyal
Judas-like
Trojan-horse
alienated
apostate
betraying
breakaway
collaborative
deceitful
degenerate
disaffected
double-crossing
double-dealing
estranged
extreme
extremistic
factious
faithless
false
fifth-column
insurgent
insurrectionary
insurrectionist
mutineering
mutinous
perfidious
quisling
quislingistic
rebel
rebellious
recreant
renegade
revolutional
revolutionary
riotous
seditionary
seditious
subversive
tergiversant
tergiversating
treacherous
treasonable
treasonous
turbulent
turncoat
two-timing
atrocious
avaricious
bloodthirsty
crafty
dastardly
despicable
devious
dishonest
dishonourable
hypocritical
infamous
insolent
nefarious
ungrateful
villainous