01 a. Holding or adhering to any opinion, purpose, or design, with obstinacy; perversely persistent; obstinate; as, pertinacious plotters; a pert…
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1.
Holding or adhering to any opinion, purpose, or design, with obstinacy; perversely persistent; obstinate; as, pertinacious plotters; a pertinacious beggar.
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2.
Resolute; persevering; constant; steady.“Diligence is a steady, constant, and pertinacious study.” — South.
Syn.
Obstinate; stubborn; inflexible; unyielding; resolute; determined; firm; constant; steady.