'nonnationalistic' originates from English, specifically the prefix 'non-' plus 'nationalistic', where 'non-' meant 'not' (from Latin/Old English use) and 'nationalistic' comes from 'national' (from Latin 'natio').

'nonnationalistic' formed by attaching the negative prefix 'non-' to 'nationalistic'. 'National' comes from Latin 'natio' (meaning 'birth, origin'), passed through Old French/Middle English as 'nation' and gave rise to 'national' and later 'nationalistic'; adding 'non-' produced the modern adjective.

Initially, the root 'natio' meant 'birth' or 'a group born together' and evolved to mean 'a people or country'; 'nationalistic' later meant 'devoted to national interests or superiority'. 'Nonnationalistic' developed as a negation, meaning 'not supporting nationalism', a usage consistent with modern negative-prefix formation.