Synonyms:
faithless, traitorous, unfaithful, treasonable, treasonous
Meaning: having the character of, or characteristic of, a traitor; "the faithless Benedict Arnold"; "a lying traitorous insurrectionist"
Usage examples
And the gods were angry with Their traitorous streams.
'Noakes, you are disillusioning, and incorrect, and moreover traitorous to your kind.'