the permanent, dedicated, and completely faithful nucleus of a group or movement, as of a political party.
2.
an unyielding or intransigent element in a social or organizational structure, as that part of a group consisting of longtime adherents or those resistant to change.
3.
those whose condition seems to be without hope of remedy or change.
mod. sexually explicit; pornographic. : You can't sell that hard-core stuff in a store like this!
mod. extreme; entrenched. : There are too many hard-core cases of poverty there.
mod. very good; stunning; great. : I'd like a really hard-core pizza with at least five kinds of cheese.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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[hahrd-kawr, -kohr] 