Synonyms of hard-core in English:

hard-core


See definition of hardcore

adjective

1‘a hard-core following’

SYNONYMS
diehard, staunch, dedicated, committed, steadfast, hard-line, dyed-in-the-wool, long-standing
extreme, entrenched, radical, intransigent, uncompromising, rigid
informal deep-dyed
ANTONYMS

moderate