1) political discontent; disloyalty (disaffection)
2) (an act of) disloyalty or being unfaithful, especially to a wife or husband (infidelity)
the act of conspiring
collusion in plan
(an instance of) defecting , e.g. to another political party (or its leader), to another religion etc
abandonment
political discontent; disloyalty
alienation, estrangement
the absence of gratitude
ungratefulness
infidelity
infidelity