American Oxford Thesaurus
hard-core
hard-core adjective hard-core fans of the sport: diehard, staunch, dedicated, committed, steadfast, dyed-in-the-wool, long-standing; hardline, extreme, entrenched, radical, intransigent, uncompromising, rigid.
Oxford Thesaurus
hard-core
hard-core adjective a hard-core following: diehard, staunch, dedicated, committed, steadfast, hard-line, dyed-in-the-wool, long-standing; extreme, entrenched, radical, intransigent, uncompromising, rigid; informal deep-dyed. ANTONYMS moderate.
Sanseido Wisdom Dictionary
hard-core
h à rd-c ó re 形容詞 〖名詞 の前で 〗1 頑固な, 妥協しない, 筋金入りの 〈人 〉.2 露骨な, あけすけな 〈性描写など 〉.~̀ p ó rn [porn ó graphy ]ハードコアポルノ .