Devout (adjective)

1. Having or showing deep religious feeling or commitment.
2. Having or showing great reverence or respect for something.

Origin:

From old french devot, from latin devōtus ("devoted"), past participle of devoveō ("i devote"), from de- ("away from") + voveō ("i vow").

Examples:

1. She was a devout Catholic and attended church every Sunday.
2. He was a devout follower of the guru and spent many hours meditating every day.
3. The devout followers of the religion would go on pilgrimage every year.
4. The devout employee was always willing to put the company's needs before his own.
5. The devout athlete was always willing to put in extra hours of training to improve.