reactionary
adjectiveCharacterized by reaction, especially opposition to progress or liberalism; extremely conservative.
nounAn opponent of progress or liberalism; an extreme conservative.
Of or pertaining to reaction in general; consisting of or characterized by reflex or reciprocal action; reactive.
Specifically Of or pertaining to political reaction; favoring reaction: as, reactionary principles or movements.
nounA promoter of reaction; specifically, one who attempts to check, undo, or reverse political action.
adjectiveBeing, causing, or favoring reaction.
nounOne who favors reaction, or seeks to undo political progress or revolution.
adjectiveVery
One who is opposed to change.