1.  stubbornness(n = noun.attribute) mulishness, obstinacy, obstinance - the trait of being difficult to handle or overcome;
is a kind of intractability, intractableness
Derived form adjective stubborn₂

2.  stubbornness(n = noun.attribute) bullheadedness, obstinacy, obstinance, pigheadedness, self-will - resolute adherence to your own ideas or desires;
is a kind of firmness, firmness of purpose, resoluteness, resolution, resolve
has particulars: impenitence, impenitency, intransigence, intransigency
Derived form adjective stubborn₁