Synonyms for Ascetical (same or very similar meaning)
WordNet sense 1 (pertaining to or characteristic of an ascetic or the practice of rigorous self-discipline):
asceticWordNet sense 2 (practicing great self-denial):
spartan, austereWordNet sense 3 (sparing in consumption of especially food and drink):
abstemiousFrom the ODE community, based on WordNetadd/edit