sanctimony

The story

1. Latin · derived fromsānctimōnia“sanctity, sacredness; purity, chastity”
2. Middle French · derived fromsanctimonie
3. English todaysanctimony

From Middle French sanctimonie, from Latin sānctimōnia (“sanctity, sacredness; purity, chastity”), from sanctus (“holy”) + -monia (“action or result of an action”).