Etymology
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hardcore

also hard-core; 1936 (n.); 1951 (adj.); from hard (adj.) + core (n.). Original use seems to be among economists and sociologists, in reference to unemployables. Extension to pornography is attested by 1966. Also the name of a surfacing material.

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Definitions of hardcore

hardcore (adj.)
intensely loyal;
Synonyms: hard-core
hardcore (adj.)
extremely explicit;
Synonyms: hard-core
From wordnet.princeton.edu