disloyal (adj.)

• alienated
• apostate
• collaborative
• deceitful
• derelict
• disaffected
• estranged
• faithless
• false
• fickle
• heretical
• inconstant
• perfidious
• recreant
• renegade
• subversive
• traitorous
• treacherous
• treasonable
• treasonous
• unfaithful
• untrue
• untrustworthy