diehard:
(also with a hyphen ‘die–hard’; plural: ‘diehards‘; pronunciation: ‘die…hard’)

a diehard cop, Bruce Willis in a movie
a person who does not like to accept social changes, and refuses to take up new ideas even if he/she knows hat he/she may be punished or may be killed for not changing; a traditionalist;
a person who tries to defend, protect or save something or someone to the last and even if their life is in danger though he/she knows that it is hopeless to do so,

a diehard (Steven Seagal, Hollywood film actor, does several ‘diehard’ characters in films)
The Hollywood movie actor Bruce Willis is a diehard; he’s acted in a five-film sequel with the name ‘Diehard’.
There are several types of diehards: religious diehards, political diehards, music diehards/diehard fans, social diehards who stick to the age-old traditions and never like to accept change.
Though the troops loyal to the dictator took control of most of the rebel dominated areas, some diehards (rebels) still fought and swore to fight hard until they die!
