(adj.adv.) : per-tĭnax, ācis, adj.tenax
* That holds fast, that clings firmly, very tenacious.
* Lit. (only poet. and in post-Aug. prose): digitus male pertinax,Hor. C. 1, 9, 24: ales unguibus pertinax,App. Flor. p. 366: tenaxne pater ejus est? Ph. Pater immo edepol pertinax, exceedingly avaricious, Plaut. Capt. 2, 2, 39.
* Transf., that lasts long, very durable: spiritus,Plin. 10, 29, 43, § 81: siligo in Allobrogum agro pertinax,id. 18, 8, 20, § 85.
* Trop., firm, constant, steadfast, persevering, unyielding; in a bad sense, obstinate, pertinacious, stubborn (cf. pervicax); constr. absol., with in and abl.; also (rare and not ante-Aug.) with in and acc., adversus and acc., ad and acc.; also (post-Aug.) with gen., Att. ap. Non. 433, 6 sq.: concertationes in disputando pertinaces,Cic. Fin. 1, 8, 27 sq.: pertinacissimus fueris, si, etc.,id. ib. 2, 33, 107: valde pertinax,id. ib. 2, 3, 9: pertinax fama,Plin. 24, 17, 101, § 159: studium, Quint. Inst. prooem.: certamen,Liv. 2, 40: stare pertinaci statu,Gell. 2, 1, 2: octoginta milia fortissimae pertinacissimaeque in retinendis armis juventutis,Vell. 2, 27, 1: pertinax virtus,Liv. 25, 14: pertinax adversus temerarios impetus,id. 28, 22, 14: pertinacior in repugnando,id. 29, 33: pertinax ad obtinendam injuriam,id. 29, 1, 17: in quod coepit pertinax et intenta,Sen. Ira, 1, 1, 2.
* Poet., with inf.: fortuna ... Ludum insolentem ludere pertinax,Hor. C. 3, 29, 51.
* Pertĭnax, ācis, m., surname of the emperor P. Helvius, who succeeded Commodus on the throne, Capitol. Pert. 1; Aur. Vict. Epit. 18.
* Very fast or firmly, very tenaciously, persistently: haec ipsa magis pertinaciter haerent, quo deteriora sunt,Quint. 1, 1, 5; Suet. Tib. 74: pertinacius resistere,Plin. 16, 43, 83, § 227: pertinacissime retinere,id. 33, 6, 32, § 100.
* Constantly, firmly, steadily, perseveringly; obstinately, stubbornly, pertinaciously: pertinaciter liberalibus studiis deditus,Suet. Claud. 40 fin.: pertinaciter in aliquā re manere,Varr. R. R. 1, 20: pertinaciter offensus, Planc. ap. Cic. Fam. 10, 23, 1: contendere,Suet. Caes. 1: studere,Sen. Ep. 5, 1.—Comp.: pertinacius insequi,Hirt. B. G. 8, 13.—Sup.: pertinacissime pabulo abstinere,Suet. Caes. 81 med.; id. Ner. 56.

s. TLL