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reactionary

noun [C]
 
 
/riˈæk.ʃən.ər.i/ US  /-er-/ disapproving

Definition

a person who is opposed to political or social change or new ideas: Reactionaries are preventing reforms.Custom, tradition and conformity reactionary
 
 
adjective
Reactionary forces/elements in the industry are preventing its progress towards greater efficiency.Custom, tradition and conformity
(Definition of reactionary noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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