apostasy (noun) – an abandonment of one’s political party, cause, or faith
BREAKDOWN: APO- (away) + STAS- (to stand) + -Y (state)
— an apostate is one who forsakes principles or faith
This word is built on the root STAS-, which means to stand or standing still.
Common STAS- words include ecstasy, system, and thermostat.
More esoteric STAS- words include ananastasia and isostasy.