noun[often as modifier]
- A person who strongly opposes change or who continues to support something in spite of opposition: my stepfather was a diehard Republican a diehard Yankees fanMore example sentences
hard-line, hard-core, reactionary, ultra-conservative, conservative, traditionalist, unprogressive, dyed-in-the-wool, deep-dyed, long-standing, staunch, steadfast, intransigent, inflexible, immovable, unchanging, uncompromising, unyielding, indomitable, adamant, rigid, entrenched, set in one's ways• informal blimpishhardliner, reactionary, ultra-conservative, conservative, traditionalist, intransigent; fanatic, zealot
- With the support from their diehard fans, Rangers are confident they are really set for something big this season.
- It became the home of the most diehard opposition to colonialism in the Arab world.
- They have no chairman, no money and only a few hundred diehard supporters who turn up more in hope than expectation.
mid 19th century: from die hard (see die1).