pertinaciously
 (ad.)執拗地;頑固地
 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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 pertinaciously
      adv : in a dogged and pertinacious manner; "he struggled
            pertinaciously for the new resolution"