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pertinacious adjective
/ˌpɜː.tɪˈneɪ.ʃəs/
/ˌpɝː.tənˈeɪ-/ adj formal Definition
very determined and refusing to be defeated by problems
Like most successful politicians, she is pertinacious and single-minded in the pursuit of her goals.
(Definition of pertinacious adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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