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Adjective: ascetical  u'se-ti-kul
  1. Pertaining to or characteristic of an ascetic or the practice of rigorous self-discipline
    "ascetical practices";
    - ascetic
  2. Practising great self-denial
    "Be systematically for no other reason than that you would rather not do it";
    - ascetic, austere, spartan

See also: abstemious

Encyclopedia: Ascetical