a person who vigorously maintains or defends a seemingly hopeless position, outdated attitude, lost cause, or the like.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.

noun

grimness , implacability , implacableness , incompliance , incompliancy , inexorability , inexorableness , inflexibility , inflexibleness , intransigence , intransigency , obduracy , obdurateness , relentlessness , remorselessness , rigidity , rigidness