hardcore

Broken bricks, stone and/or other aggregate used as foundations, especially in road and path laying.

Several music genres, including:

Having an extreme dedication to a certain activity; diehard.

“He's a hardcore gamer.”

Particularly intense; thrillingly dangerous or erratic; desirably violent in appearance; pleasing or "cool" due to intensity or danger.

“That show was hardcore, dude.”

Resistant to change.

Obscene or explicit.

Depicting penetration and abnormal sexual activity.

Faster or more intense than the regular style.