ASCETICAL

ascetic, ascetical, austere, spartan

(adjective) practicing great self-denial; “Be systematically ascetic...do...something for no other reason than that you would rather not do it”- William James; “a desert nomad’s austere life”; “a spartan diet”; “a spartan existence”

ascetic, ascetical

(adjective) pertaining to or characteristic of an ascetic or the practice of rigorous self-discipline; “ascetic practices”

Source: WordNet® 3.1

Adjective

ascetical (comparative more ascetical, superlative most ascetical)

ascetic

Source: Wiktionary