'non-ascetic' is formed from the prefix 'non-' (from Latin 'non', meaning 'not') combined with 'ascetic' (from Greek 'askētēs', meaning 'one who exercises' or 'practitioner').

'ascetic' comes from Greek 'askētēs' via Late Latin/Medieval Latin 'asceticus' into Middle English as 'ascetik' and eventually modern English 'ascetic'. The negative prefix 'non-' was attached in Modern English to create 'non-ascetic'.

Originally, Greek 'askētēs' referred to someone who 'practices' or 'trains' (often in a religious or disciplined sense); over time 'ascetic' narrowed to mean 'practicing severe self-discipline and abstention', and 'non-ascetic' came to mean 'not following such self-denying practices'.