ˌhard-core BrE AmE , hard‧core /ˈhɑːdkɔː $ ˈhɑːrdkɔːr/ adjective
1 . [only before noun] having an extreme way of life or an extreme belief that is very unlikely to change:
a hard-core drug addict
hard-core racists
2 . hard-core pornography magazines, films etc that show the details of sexual behaviour, often in an unpleasant way