hardcore

About 0.28 uses per million words.

Meaning

adjective Having an extreme dedication to a certain activity.
He's a hardcore gamer.
adjective So hard as to require extreme dedication to complete.
adjective Particularly intense; thrillingly dangerous or erratic; desirably violent in appearance; pleasing or "cool" due to intensity or danger.
That show was hardcore, dude.
adjective Requiring a large amount of practice and skill to complete, usually with extreme penalties for failure, e.g. permadeath.
Elden Ring is known for being one of the most hardcore open-world RPGs in existence.
adjective Resistant to change.
adjective Obscene or explicit.
adjective Depicting penetration and abnormal sexual activity.
adjective Faster or more intense than the regular style.