die-hard /ˈdaɪˌhɑɚd/ adjective Learner's definition of DIE-HARD
[more die-hard; most die-hard]
: very determined or loyal有决心的;忠诚的 especially : very loyal to a set of beliefs and not willing to change those beliefs顽固的;死硬的 — see also die hard at 1die
— diehard
noun, plural diehards [count]