hard core
Hard core consists of pieces of broken stone that are used as a base on which to build roads.
(mainly BRIT) n-uncount
Translation English - Cobuild Collins Dictionary  

hard-core
1 dedicated, die-hard, dyed-in-the-wool, extreme, intransigent, obstinate, rigid, staunch, steadfast
2 explicit, obscene, X-rated (informal)
English Collins Dictionary - English synonyms & Thesaurus

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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"