adjective [ only before noun ]
1.
having a belief or a way of behaving that will not change :
hard-core party members
2.
showing or describing sexual activity in a detailed or violent way :
They sell hard-core pornography .
—compare soft-core
adjective [ only before noun ]
1.
having a belief or a way of behaving that will not change :
hard-core party members
2.
showing or describing sexual activity in a detailed or violent way :
They sell hard-core pornography .
—compare soft-core
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005