as·cet·ic

– noun
1. a person who dedicates his or her life to a pursuit of contemplative ideals and practices extreme self-denial or self-mortification for religious reasons.
2. a person who leads an austerely simple life, esp. one who abstains from the normal pleasures of life or denies himself or herself material satisfaction.
3. a monk; hermit.
– adj.
4. rigorously abstinent; austere.
5. exceedingly strict or severe in religious exercises or self-mortification.