'antimoralistic' originates from the prefix 'anti-' (from Greek 'anti-', meaning 'against') combined with the adjective 'moralistic' (ultimately from Latin 'moralis'), where 'mos/moris' meant 'custom' or 'habit'.

'antimoralistic' formed by combining 'anti-' + 'moralistic.' 'Moral' entered English via Old French 'moral' from Latin 'moralis'; the suffix '-istic' (from Greek/Latin formation) created 'moralistic,' and modern English combined these elements to form 'antimoralistic.'

Initially constructed to mean 'against moralism' (i.e., opposed to moralizing attitudes); over time its usage has remained close to this original sense, denoting opposition to moralistic judgment or preaching.