pertinacious, stubborn, obstinate
1. Stubbornly or determinedly adhering to an opinion, purpose, or course of action; persistent despite difficulty
He maintained a pertinacious belief in his innocence despite the evidence.
Ele mantinha uma crença pertinaz em sua inocência apesar das evidências.
2. Characterized by or showing obstinate persistence; unyielding
Her pertinacious efforts to reform the system finally bore fruit.
Seus esforços pertinaces para reformar o sistema finalmente deram frutos.
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