'antiliberalistic' is formed from the prefix 'anti-' (from Greek 'antí' meaning 'against') plus 'liberalistic', itself derived from 'liberal' + the adjectival suffix '-istic'. 'liberal' comes from Latin 'liberalis' meaning 'of freedom, generous'.

'liberal' traces to Latin 'liber' ('free') → Latin 'liberalis' → Old French/Middle English 'liberal' → modern English 'liberal'. The suffix '-istic' (from Greek/Latin adjectival formations) was attached to form 'liberalistic', and the prefix 'anti-' was later prefixed to produce 'antiliberalistic'.

Initially elements meant 'against' ('anti-') and 'of freedom/generosity' ('liberalis'); combined historically to mean 'opposed to liberal ideas'. Over time this produced the modern adjective specifically describing opposition to liberalism or liberal policies.