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English definition of “diehard”

diehard

noun [C]     /ˈdaɪ.hɑːd/ US  /-hɑːrd/ disapproving
someone who is unwilling to change or give up their ideas or ways of behaving, even when there are good reasons to do so: a diehard conservative/fanStubborn and determined people
(Definition of diehard noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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