a political movement directed against a revolution

political conservatism

a period of gradual and continued loss of importance, strength

lessening

(an instance of) defecting , e.g. to another political party (or its leader), to another religion etc

abandonment

reversion

reversion

a change back into bad health, behaviour etc

deterioration, weakening

a person who changes her or his political or religious beliefs and joins a rival group

rebellious