Per`ti*na"cious (?), 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.

2. Resolute; persevering; constant; steady.

Diligence is a steady, constant, and pertinacious study.

Syn. -- Obstinate; stubborn; inflexible; unyielding; resolute; determined; firm; constant; steady.

-- Per`ti*na"cious*ly, adv. -- Per`ti*na"cious*ness, n.

• holding tenaciously to an opinion or purpose
  
• stubbornly resolute or tenacious