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Definition of pertinacious:

  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.


intractable, dour, forbidding, long, pigheaded, determined, continue, grim, opinionated, persistent, perverse, lasting, coherent, unyielding, saturnine, haunting, unconquerable, fixed, firm, refractory, glum, unrelenting, decided, sour, stubborn, retentive, indomitable, bullheaded, glowering, sullen, dogged, morose, dark, moody, relentless, tenacious, headstrong, resolved, unflinching, willful, heady, stiff-necked, immovable, contumacious, bulldog, recollective, resist.

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