Stubbornness
Part of speech: noun
Definition: The state of being stubborn.
Example sentence: I think my stubbornness, hardheadedness and stupidity is what has allowed me to play for 20 years.
Obstinacy
Part of speech: noun
Definition: The state, or an act, of stubbornness or doggedness.
Example sentence: The difference between perseverance and obstinacy is that one comes from a strong will, and the other from a strong won't.