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Synonyms for Reactionary (same or very similar meaning)

WordNet sense 1 (an extreme conservative; an opponent of progress or liberalism):
ultraconservative, extreme right-winger

WordNet sense 2 (extremely conservative):
far-right, reactionist

WordNet sense 3 (of or belonging to the political or intellectual right):
right


From the ODE community, based on WordNetadd/edit