Definitions

1. adjective

extremely enthusiastic or dedicated to a particular activity, style, or interest

“She’s a hardcore fan of the band and attends every concert.”

2. noun

a person who is extremely enthusiastic or dedicated to a particular activity, style, or interest

“The hardcore crowd cheered on the team throughout the game.”

3. adverb

in a way that is extremely enthusiastic or dedicated to a particular activity, style, or interest

“He played the guitar hardcore for hours on end.”