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pertinacious

adjective
🔊/ˌpɜːtɪˈneɪʃəs/
🔊/ˌpɜːrtnˈeɪʃəs/
 (formal)
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  1. determined to achieve a particular aim despite difficulties or opposition坚定不移的；坚决的；义无反顾的Topics Successc2
    Word Originearly 17th cent.: from Latin pertinax, pertinac- ‘holding fast’ + -ous.