diehard
/ˈdaɪ.hɑɹd/ adjective C2- Unreasonably or stubbornly resisting change.
- Fanatically opposing progress or reform.
- 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.
- Strongly or fanatically determined or devoted.
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