Opposed to or resisting progress, reform, or social advancement; conservative or reactionary.
From anti- (against) + progressive (moving forward, advancing). Developed as a political term in 19th and 20th-century discourse to describe those opposing progressive reforms in areas like voting rights, labor, and social justice.
Interestingly, what counts as 'progressive' versus 'antiprogressive' completely depends on the time period and who's talking—in 1920 some called labor regulations antiprogressive, while today they seem progressive, showing how these terms are relative.
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