adjective: Opposed to change, progress, or reform; extremely conservative.
noun: An opponent of change, progress, or reform.
From French réactionnaire. The word was used to describe an opponent of the French Revolution. Earliest documented use: 1799.
“Microsoft’s critics portray its behavior as reactionary, saying the company is trying to protect old business models.”
Ashlee Vance; Chasing Pirates: Inside Microsoft’s War Room; The New York Times; Nov 6, 2010.
Explore “reactionary” in the Visual Thesaurus.