As an adjective treasonous
is like or in the way of treason.
As a noun treachery is
deliberate, often calculated, disregard for trust or faith.
Like or in the way of treason.
:His treasonous actions earned Benedict Arnold eternal scorn.
Deliberate, often calculated, disregard for trust or faith.
The act of violating the confidence of another, usually for personal gain.
* Punic faith