hard-core
adjective [ usually before noun ]
(also hardcore) ukusserious or difficult to deal with and unlikely to change:
Hard-core unemployment usually results when a worker is disabled and is not able to work.
He will focus more on fighting hard-core antitrust cases.
The two counties are predominantly sprawling suburbs and shore towns, with relatively few pockets of hard-core poverty and crime.
hard-core homeless/unemployed
used to describe the people who are most interested and involved in an organization, group, or activity:
What the hard-core environmentalists want is punitive fossil-fuel restrictions.
hard-core fans/supporters
hard-core insurgents/terrorists
See also
core