pervĭcācĭa (noun F) : pervicax
* Firmness, inflexibility; in a bad sense, stubbornness, obstinacy (syn.: pertinacia, perseverantia): avaritia, ambitio, mulierositas, pervicacia,Cic. Tusc. 4, 11, 26: haec pervicacia tua et superbia coëgit me loqui,Liv. 9, 34, 24: Aegyptia, Treb. Poll. Claud. 11, 1.
* Transf., in a milder signif., firmness, steadiness, steadfastness: tu pertinaciam esse, hanc praedicas, ego pervicaciam aio, Att. ap. Non. 432, 32 sq. (Trag. Rel. v. 4 Rib.; v. the entire passage under pervicax): quantā pervicaciā in hostem, tantā beneficentiā adversus supplices utendum,Tac. A. 12, 20.— Of things: castanea pedamentis omnibus praefertur perdurandi pervicaciā,Plin. 17, 20, 34, § 147.

s. TLL