obduracy

n.
The state or quality of being intractable or hardened.

noun

The quality or state of being stubbornly inflexible: die-hardism, grimness, implacability, implacableness, incompliance, incompliancy, inexorability, inexorableness, inflexibility, inflexibleness, intransigence, intransigency, obdurateness, relentlessness, remorselessness, rigidity, rigidness, stubbornness. See resist/yield.

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The noun has one meaning:

Meaning #1: resoluteness by virtue of being unyielding and inflexible
  Synonyms: adamance, unyieldingness

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