A reactionary is someone who opposes reform or change, especially in the realm of politics.

A reactionary is someone reacting (in horror) to what others consider to be progress. No one describes themselves as reactionary — you will hear it more often as a condemnation, as in "I cannot support the reactionary policy of mandatory military service for 18-year-olds."

Definitions of reactionary
  1. adjective
    extremely conservative
    synonyms: far-right, reactionist
    of or belonging to the political or intellectual right
  2. noun
    an extreme conservative; an opponent of progress or liberalism
    synonyms: extreme right-winger, ultraconservative
    see moresee less
    a reactionary politician in the United States (usually from the South)
    Blimp, Colonel Blimp
    any elderly pompous reactionary ultranationalistic person (after the cartoon character created by Sir David Low)
    type of:
    conservative, conservativist
    a person who is reluctant to accept changes and new ideas
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