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3 definitions found
 for pertinacious
From The Collaborative International Dictionary of English v.0.48 :

  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]

From WordNet (r) 3.0 (2006) :

      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]

From Moby Thesaurus II by Grady Ward, 1.0 :

  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

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