traitorous       
adjective  formal disapproving uk/ˈtreɪ.tər.əs/ us/ˈtreɪ.t̬ɚ.əs/
 叛国的,背叛的,谋叛的
not loyal to your own country, social group, beliefs, etc.
  You're a traitorous coward, and you're going to pay the price for it. 你是个叛徒和懦夫,你将为此付出代价。 
 It was a traitorous thought, and she tried to reject it. 这是一个叛徒的想法,她让自己不要这么想。 
 See: traitor
 - More examples
 - "I condemn the traitorous hands behind this disgraceful murder," the Prime Minister said.
 - This kind of criminal conduct represents the most traitorous action imaginable against a country.
 - I would never call anyone on their side unpatriotic or traitorous.