Opposed to patriotism or national loyalty; described as hostile to one's country or its interests.
From anti- + patriotic (pertaining to love of country). The -ic adjective form, following the pattern of patriotic from patriot, became common during 20th-century wars and political conflicts.
Antipatriotic is a fascinating word because it reveals how nationalism weaponizes language—disagreeing with government policy gets labeled antipatriotic, conflating criticism with disloyalty. It's propaganda built into vocabulary.
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