seditious (adj.)

• alienated
• breakaway
• contumacious
• disaffected
• disloyal
• dissident
• extreme
• factious
• faithless
• inflammatory
• insurgent
• insurrectionary
• lawless
• mutinous
• perfidious
• rabble-rousing
• rebellious
• refractory
• revolutionary
• riotous
• subversive
• traitorous
• treacherous
• treasonable
• turbulent
• unfaithful
• violent