An ascetic person has a way of life that is simple and strict, usually because of their religious beliefs. She has never been close to her ascetic , workaholic father. ...priests practising an ascetic life. ...his bony, ascetic face. ASCETICISM definition : 1. the practice of living a simple life without physical pleasures, often for religious reasons…. Learn more. ASCETIC definition: 1. avoiding physical pleasures and living a simple life, often for religious reasons: 2. someone…. Learn more. The term ' ascetic ' derives its etymology from the Greek word 'askētikos,' which means 'rigorous' or 'laborious.' This adjective is derived from the noun 'askētēs,' which referred to a practitioner of askēsis, a term used to describe rigorous physical and mental exercises or training. Askēsis itself is rooted in the Greek verb 'askein,' meaning 'to exercise' or 'to train.' Over time, the term ' ascetic ' came to be associated with individuals who lead a life of extreme self-discipline ...