hardcore Definition

1. Pieces of broken brick, stone, etc used as a base for a road.
2. The central, most important group within an organization, resistant to change.

Form: hard core (also)
3. A type of rock music consisting of short fast songs with minimal melody and aggressive delivery.

Form: hard-core punk (originally)
4. A form of fast rhythmic dance music developed in the UK in the early 1990s.

1. Said of pornography: describing or depicting sexual acts in explicit detail.
2. Having long-lasting, strong and unchanging beliefs.

Example: hard-core revolutionaries
Thesaurus: absolute, steadfast, dedicated, determined, devoted, diehard, dyed-in-the-wool, intransigent, obstinate, staunch, uncompromising, unwavering; Antonym: moderate.