A traitorous action will betray or bring danger to a country or to the group of people that someone belongs to.
例句
...the monstrous betrayal of men by their most traitorous companions.最为背信弃义的同伴对他们令人发指的出卖...the movement could be labeled as divisive, even traitorous.该运动可以被称作是分裂性的，甚至是背叛性的。