'antipacifistic' originates in Modern English as a compound formed from the prefix 'anti-' (from Greek 'anti-' meaning 'against') and 'pacifistic' (related to 'pacifist'/'pacific').

'antipacifistic' was formed in Modern English by attaching the productive prefix 'anti-' to 'pacifistic' (itself derived from 'pacifist' and ultimately from Latin 'pax, pacis' meaning 'peace'), producing the sense 'against pacifism'.

Initially coined simply to mean 'against pacifism', its use has remained narrowly descriptive of attitudes opposing pacifist principles; it has not undergone a major semantic shift.