'antiliberally' originates from a combination of the prefix 'anti-' (from Greek 'antí' meaning 'against'), the adjective 'liberal' (from Latin 'liberalis', from 'liber' meaning 'free'), and the adverbial suffix '-ly' (from Old English '-lic'/'-lice' via Middle English).

'antiliberal' formed in English by combining 'anti-' + 'liberal' (attested from the 19th century in political usage); the adverbial form 'antiliberally' was created by adding the productive English suffix '-ly' to form an adverb.

Initially the elements meant 'against' + 'free' (via 'liberal'), and over time the compound came to mean 'opposed to liberalism'; the adverbial form now means 'in a manner opposed to liberal principles.'