diehard's Usage Examples:

In the film Monika and her husband Jes (played by Ges Selmont) are diehard Sox fans.

The First Earl of Dumbarton nicknamed the breed "the diehard".

Synonyms for hardliner include diehard, hawk, extremist, fanatic, or zealot.

He is best known for creating the diehard tests, a suite of software for measuring statistical randomness.

The diehard tests are a battery of statistical tests for measuring the quality of a random number generator.

Synonyms:

traditionalist; conservativist; Rip van Winkle; conservative;

Antonyms:

unorthodox; left; juvenile; nonconformist; liberal;