pertinacious
adjective/ˌpɜːtɪˈneɪʃəs/
/ˌpɜːrtnˈeɪʃəs/
(formal)- determined to achieve a particular aim despite difficulties or oppositionTopics Successc2Word Originearly 17th cent.: from Latin pertinax, pertinac- ‘holding fast’ + -ous.
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pertinacious