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