religious

The story

1. Latin · derived fromreligiōsus“religious, superstitious, conscientious”
2. Old French · derived fromreligious
3. Anglo-Norman · derived fromreligieus
4. Middle English · inherited fromreligiouse
5. English todayreligious

From Middle English religiouse, religious, religius, religeous, from Anglo-Norman religieus, religius, from Old French religious, religieux, and their source, Latin religiōsus (“religious, superstitious, conscientious”), from religiō. Doublet of religieux.