pervicacity
/ˌpəːvɪˈkasɪti/Now rare
noun
The quality or state of being pervicacious; obstinacy; stubbornness; wilfulness.
Origin
Early 17th century; earliest use found in Robert Parsons (1546–1610), Jesuit. From post-classical Latin pervicacitas obstinacy from classical Latin pervicāc-, pervicāx + -itās. Compare classical Latin pervicācia.