pervicus

pervĭcus, a, um, adj. [pervico for pervinco],

• stubborn, obstinate (ante-class. collat. form of pervicax): pervico Ajax animo atque evocabili, Att. ap. Non. 487, 15 (Trag. Rel. p. 131 Rib.); Plaut. Fragm. ap. Non. 487, 15.