hard-core

[hahrd-kawr, -kohr]
adjective
1.
unswervingly committed; uncompromising; dedicated: a hard-core segregationist.
2.
pruriently explicit; graphically depicted: hard-core pornography. Compare soft-core.
3.
being so without apparent change or remedy; chronic: hard-core inflation; hard-core unemployment.

Origin:
1950–55

Dictionary.com Unabridged
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World English Dictionary
hardcore (ˈhɑːdˌkɔː)
 
n
1.  a style of rock music characterized by short fast numbers with minimal melody and aggressive delivery
2.  a type of dance music with a very fast beat

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Example sentences
The ugly truth is that the general culture can't handle hardcore culture.
The result is a movie that even hardcore motorcycle fans will find to be as
  implausible as the plot.
But solid, hardcore and even breathtaking basketball.
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