diehard

1. (idiomatic)Unreasonably or stubbornly resisting change.

2. (idiomatic)Fanatically opposing progress or reform.

3. (idiomatic)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.

   eingefleischt, hartgesotten

4. (idiomatic)Strongly or fanatically determined or devoted.

1. He's just a diehard company man.

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2. I'm a diehard co-op member.

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3. Tom is a diehard Yankees fan, and rarely misses a home game.

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regular