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Definition of obstinacy : 1. A fixedness in will, opinion, or resolution that can not be shaken at all, or only with great difficulty; firm and usually unreasonable adherence to an opinion, purpose, or system; unyielding disposition; stubborness; pertinacity; persistency; contumacy.
2. The quality or state of being difficult to remedy, relieve, or subdue; as, the obstinacy of a disease or evil.

Synonyms:

tenaciousness, self-command, disorderliness, obstinateness, pertinaciousness, unmanageability, recalcitrancy, obstreperousness, unruliness, possession, purpose, self-possession, self-will, ungovernableness, willpower, untowardness, obstinance, fractiousness, uncontrollability, self-control, indocility, will power, peace, pertinacity, wildness, resist, willfulness, perverseness, uncontrollableness, perversity, order, pigheadedness, intractability, refractoriness, intractableness, control

hardheadedness, contumacy, inflexibility, mulishness, tenacity, bullheadedness

contradiction, suppression, adversary, conflict, repression, fight, impediment, counterattack, opposition, disagreement, protest, confrontation, friction, counteraction, antagonism, inhibition, hindrance, objection, obstruction, rebuff, interference, defiance, repulsion, challenge, dispute, resistance

insubordination, insurgency, affront, audacity, dissent, attack, insolence, dissension, boldness, recalcitrance, contravention, stubbornness, temerity, rebelliousness

cynicism, darkness, melancholy, gloominess, fretfulness, grimness, crabbiness, grumpiness, hostility, petulance, unfriendliness, irascibility, dourness, moroseness, long-facedness, glumness, sullenness, dejection, malevolence, moodiness, sourness, sulkiness, surliness, meanness, cantankerousness, grouchiness, crossness

disinclination, reluctance, averseness, unwillingness, noncooperation, contrariness, balkiness, repugnance, distaste, repellency

persistency, determination, strength, steadfastness, stiffness, toughness, doggedness, hardness, viscidity

Usage examples:

• He adhered to them, however, with the obstinacy which is generally found in ignorant men accustomed to be fed with flattery. - "The History of England from the Accession of James II. Volume 1 (of 5)", Thomas Babington Macaulay.
• The result of Napoleon's obstinacy was, that he was kept three whole days on bread and cheese, and that cheese was not 'broccio'. - "The Project Gutenberg Memoirs of Napoleon Bonaparte", Bourrienne, Constant, and Stewarton.
• Much of his time he did devote to hunting, but there were half hours devoted in company with Lady Albury to Ayala's perfection and Ayala's obstinacy. - "Ayala's Angel", Anthony Trollope.