Answer: treasonous

AnswerCrossword Clue
TREASONOUSDisloyal
TREASONOUSArnold-esque?
TREASONOUSShowing perfidy.
TREASONOUSLike Arnold's action
TREASONOUSDisloyal to the state
TREASONOUSSpying against one's own country, say
treasonoustreasonable