hard-core

/HH AA1 R D K AO0 R/
adjective
  1. 1

    Having an extreme dedication to a certain activity; diehard.

    โ€œHe's a hardcore gamer.โ€

  2. 2

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

    โ€œThat show was hardcore, dude.โ€

  3. 3

    Resistant to change.

  4. 4

    Obscene or explicit.

  5. 5

    Depicting penetration and abnormal sexual activity.

  6. 6

    Faster or more intense than the regular style.

Source: https://en.wiktionary.org/wiki/hard-core, https://en.wiktionary.org/wiki/hardcore