a person who vigorously maintains or defends a seemingly hopeless position, outdated attitude, lost cause, or the like.
resisting vigorously and stubbornly to the last; stubborn.
Also, diehard.

1835–45; noun, adj. use of verb phrase die hard

die-hardism, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  a person who resists change or who holds onto an untenable position or outdated attitude
2.  (modifier) obstinately resistant to change

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

also die-hard, 1844 (n.), in reference to the 57th Regiment of Foot in the British Army; as an adjective, attested from 1877; from die (v.) + hard. As a brand name of an automobile battery, DieHard, introduced by Sears in 1967.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Whether it will be enough for diehard fans remains to be seen.
Our collection runs the gamut from useful gifts for the diehard backpacker, to
  delicate, globally inspired jewelry.
Diehard boarders are snatching up second homes here, but so far it has managed
  to stay affordable.
The app is aimed, of course, at the type of diehard fan of the national pastime
  who might be inclined to chronicle every pitch.
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