'anti-capitalistically' originates from Modern English, specifically from the prefix 'anti-' (from Greek 'antí' meaning 'against') combined with 'capitalistically' which derives from 'capital' (Latin 'capitale') plus the adjective-forming suffix '-istic' and the adverbial suffix '-ally'.

'anti-capitalistically' developed from the adjective 'anti-capitalistic' + the adverbial suffix '-ally'; 'capital' came into English via Old French/Latin (Latin 'capitale'), producing 'capital' → 'capitalistic'/'capitalistic' → 'anti-capitalistic' → 'anti-capitalistically'.

Initially the components conveyed 'against capital' or 'against capital-related practices'; over time the combined form has come to mean more broadly 'in a manner opposed to capitalism or capitalist systems'.