Difference between Obstinacy and Bullheadedness

OBSTINACY vs BULLHEADEDNESS: NOUN

The state, or an act, of stubbornness or doggedness.
The quality or state of being difficult to remedy, relieve, or subdue.
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.
An unyielding character or quality; continued resistance to the operation of remedies or to palliative measures: as, the obstinacy of a fever or of a cold.
The character or condition of being obstinate; pertinacions adherence to an opinion, purpose, or course of conduct, whether right or wrong, and in spite of argument or entreaty; a fixedness, and generally an unreasonable fixedness, of opinion or resolution, that cannot be shaken; stubbornness; pertinacity.
The act or an instance of being stubborn or refractory.
The state or quality of being stubborn or refractory.
Resolute adherence to your own ideas or desires
The trait of being difficult to handle or overcome

The characteristic of being bullheaded.
Resolute adherence to one's own ideas or desires.
Figuratively, blind, unreasoning impetuosity or obstinacy; stupid aggressiveness; blockheadedness.
The quality of being bull-headed.
Resolute adherence to your own ideas or desires

Obsession, Determination, Tenacity, Steadfastness, Persistence, Insistence, Inflexibility, Recalcitrance, Intransigence, Mulishness, Self will, Bullheadedness, Pigheadedness, Obstinance, Stubbornness

Cowardice, Doggedness, Intransigency, Pusillanimity, Arrogance, Perseverance, Obsession, Tenacity, Steadfastness, Persistence, Recalcitrance, Intransigence, Mulishness, Pigheadedness, Stubbornness

Confusion, inversion, disorder; mismanagement, laxity; antipathy, repulsion; obstinacy; mood; agglomeration, frightful.
Some carriers will hold out either through obstinacy or inability.
Orwell is seeking to demo the obstinacy of human nature.
And, despite our obstinacy, that's what we wait for.
This he ought to do without pride, obstinacy or refusal.
Reflect on the disasters which may ensue from longer obstinacy.
It cost him years of what was called obstinacy.
The Leipzig judges have now ennobled this obstinacy.
Obstinacy will prevent you from a correct decision.
He opposed it with the obstinacy of a deaf man, with a violent obstinacy.

In no uncertain terms she told her husband what she thought of his bullheadedness and vile temper.
Airport construction under the shadow of climate change betrays the bullheadedness that typifies our time.
And, not to be underestimated, there was sheer presidential bullheadedness.