diehard

Plural: diehards

Noun

• A person who stubbornly adheres to an old cause or attitude.
• one who adheres to traditional views
• A person with such an attitude.

Adj

• 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.
• Strongly or fanatically determined or devoted.

Examples

• For a Roman Catholic teacher, he sure is a diehard fundamentalist.
• Only a true DIEHARD Scrabble player would memorize all two-letter words.

Synonyms

traditionalist