Ascetic (adjective)

1. Relating to the practice of severe self-discipline and abstention from all forms of indulgence, typically for religious reasons.
2. Relating to or characteristic of an ascetic; austere.

Origin:

Late 16th century: via latin from greek askētikos, from askēsis "exercise, training", from askein "exercise".

Examples:

1. The monk lived an ascetic life of self-denial and devotion.
2. The ascetic lifestyle of the monk was admirable.
3. The ascetic diet of the monk was simple and plain.
4. The ascetic routine of the monk was rigorous and demanding.
5. The ascetic's devotion to his faith was unwavering.