treacherous
C1Adjektiv/US /trˈɛtʃɚəs/ TRĔCH-ər-əs; UK /trˈɛtʃɚəs/ TRĔCH-ər-əs/
Like a traitor; involving treachery; violating allegiance or faith pledged; traitorous to the state or sovereign; perfidious in private life; betraying a trust; faithless.
