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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.

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