a. [ L. pertinax, -acis; per + tenax tenacious. See Per-, and Tenacious. ] 1. Holding or adhering to any opinion, purpose, or design, with obstinacy; perversely persistent; obstinate; as, pertinacious plotters; a pertinacious beggar. [ 1913 Webster ]
2. Resolute; persevering; constant; steady. [ 1913 Webster ]
Diligence is a steady, constant, and pertinacious study. South. [ 1913 Webster ]
Syn. -- Obstinate; stubborn; inflexible; unyielding; resolute; determined; firm; constant; steady. [ 1913 Webster ]
-- Per`ti*na"cious*ly, adv. -- Per`ti*na"cious*ness, n. [ 1913 Webster ]