per·ti·na·cious /ˌpɝtṇˈeʃəs/
 (a.)執拗的,頑固的,頑強的
 Per·ti·na·cious a.
 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.   --South.
 Syn: -- Obstinate; stubborn; inflexible; unyielding; resolute; determined; firm; constant; steady.
 -- Per*ti*na*cious*ly, adv. -- Per*ti*na*cious*ness, n.
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 pertinacious
      adj : 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: bulldog, dogged, dour, tenacious,
             unyielding]