pertinacious

pertinacious
    adj 1: stubbornly unyielding; "dogged persistence"; "dour
           determination"; "the most vocal and pertinacious of all
           the critics"; "a mind not gifted to discover truth but
           tenacious to hold it"- T.S.Eliot; "men tenacious of
           opinion" [syn: {dogged}, {dour}, {persistent},
           {pertinacious}, {tenacious}, {unyielding}]
    

Pertinacious \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.
      [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]
    

127 Moby Thesaurus words for "pertinacious":
      assiduous, balking, balky, bigoted, bulldogged, bulldoggish,
      bulletheaded, bullheaded, case-hardened, clamant, clamorous,
      constant, continuing, crying, demanding, diligent, dogged,
      dogmatic, draining, enduring, exacting, exigent, exorbitant,
      extortionate, faithful, fanatic, fixed, game, gamy, grasping,
      gritty, gutsy, gutty, hardheaded, headstrong, immutable,
      importunate, inalterable, indefatigable, indomitable, industrious,
      insistent, instant, intolerant, invincible, lasting, loud, loyal,
      mettlesome, mulish, nervy, never-tiring, obstinate, opinionated,
      overzealous, patient, patient as Job, permanent, perseverant,
      persevering, persistent, persisting, perverse, pigheaded, plodding,
      plucky, plugging, preoccupied, pressing, rapt, red-blooded,
      refractory, relentless, resolute, restive, sedulous, self-willed,
      set, single-minded, sleepless, slogging, spirited, spiritful,
      spunky, stable, steadfast, steady, stiff-necked, strong-willed,
      strongheaded, stubborn, sulky, sullen, taxing, tenacious, tireless,
      tough, unabating, unconquerable, uncooperative, undaunted,
      undiscouraged, undrooping, unfailing, unfaltering, unflagging,
      unflinching, unintermitting, uninterrupted, unnodding,
      unregenerate, unrelaxing, unrelenting, unremitting, unshakable,
      unsleeping, unswerving, untiring, unwavering, unwearied,
      unwearying, unwinking, unyielding, urgent, utterly attentive,
      weariless, willful