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Synonyms for Ascetic (same or very similar meaning)

WordNet sense 1 (someone who practices self denial as a spiritual discipline):

WordNet sense 2 (pertaining to or characteristic of an ascetic or the practice of rigorous self-discipline):

WordNet sense 3 (practicing great self-denial):
spartan, austere

WordNet sense 4 (sparing in consumption of especially food and drink):

From the ODE community, based on WordNetadd/edit