ascetical in WordNet English dictionary

1. pertaining to or characteristic of an ascetic or the practice of rigorous self-discipline
   "ascetic practices"
   ascetic  ascetical 
   
2. 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  austere  spartan