'anti-feudalistic' originates from the Greek prefix 'anti-' (meaning 'against') combined with 'feudalistic', which ultimately comes from Medieval Latin 'feodalis' (from 'feodum').

'anti-feudalistic' changed through forms: Medieval Latin 'feodum' (meaning 'fief') led to Medieval Latin/Old French forms (e.g. 'feodalis' / 'feodal'), then to Middle English 'feudal', later adjective-forming '-istic' produced 'feudalistic', and finally the prefix 'anti-' was added to form 'anti-feudalistic'.

Initially related to 'feodum' meaning 'fief' and thus to the feudal system; over time 'feudal' and derived adjectives came to mean 'relating to feudalism or its social characteristics', and with the prefix 'anti-' the modern meaning became 'opposed to feudalism'.