1. a person who strongly opposes change or refuses to give up their beliefs or practices

1. stubbornly refusing to change or give up; extremely loyal or committed

Examples

• He’s a diehard fan of the baseball team and never misses a game.
• The diehard supporters refused to accept the election results.
• She remained a diehard opponent of the new policy.
• His diehard loyalty to the company impressed his colleagues.
• The diehard conservatives blocked the reform proposal.
• Even after the scandal, she maintained diehard support for the politician.
• The old professor was a diehard traditionalist who opposed modern teaching methods.