Acemetic

Relating to or characteristic of a group of early Christian monks who practiced strict asceticism and rejected worldly comforts, sometimes spelled as 'ascetic.'

From Greek 'akémetos' (unwearied, sleepless), combining 'a-' (not) + 'kémē' (sleep or rest). The variant spelling acemetic preserves the Greek form while the more common 'ascetic' shows Latin influence.