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(the) ˌhard ˈcore(British English) the small central group in an organization, or in a particular group of people, who are the most active or who will not change their beliefs or behaviour: It’s only really the hard core that bother(s) to go to meetings regularly. ▶ ˈhard-core adj.
1 having a belief or a way of behaving that will not change: a hard-core political activist
2 relating to pornography (= books, videos, etc. that describe or show naked people and sexual acts) of an extreme kind: hard-core sex magazines