'anticonservatively' is formed in Modern English by combining the prefix 'anti-' (meaning 'against') with the adjective 'conservative' and the adverbial suffix '-ly'.

'conservative' entered English from French 'conservatif' (or medieval Latin forms), ultimately from Latin 'conservare' meaning 'to preserve'; the prefix 'anti-' comes via Greek 'anti-' meaning 'against'. These elements combined over time to form 'anticonservative' and then 'anticonservatively'.

Initially, Latin 'conservare' meant 'to preserve or keep safe'; 'conservative' came to mean 'favoring preservation of existing conditions', and 'anticonservative' (and thus 'anticonservatively') developed to mean 'opposed to preserving existing conditions' or 'opposed to conservatism'.