I feel you should add perfidious and impious as possible answers to the relevant questions. :)
I agree. I suppose they feel like the direct carry-overs would be somewhat self-defeating for the purposes of learning, which is reasonable, but they should be non-preferred rather than incorrect, I think.
They have a way of disappearing.
The guy voicing this is terrible. He slurs so much its often do impossible to make out what hes sayingy
What is wrong with "Sometimes comrades are treacherous"?
Nothing. Just flag it and report "My answer should be accepted."
Is "dishonest" an inappropriate translation of perfidi?