ascetic

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
    

• pertaining to or characteristic of an ascetic or the practice of rigorous self-discipline
  • ascetic practices
    

Noun

• someone who practices self denial as a spiritual discipline

Related words

• Synonyms: 
  ascetical , austere , spartan , abstainer