Diehard
WordNet

noun


(1)   One who adheres to traditional views
WiktionaryText

Adjective



  1. unreasonably or stubbornly resisting change
  2. fanatically opposing progress or reform
  3. complete; having no opposite opinion of anything in a particular topic of one's values; thorough of in one's beliefs.
    For a Roman Catholic teacher, he sure is a diehard fundamentalist.
 
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