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English definition of “pertinacious”

pertinacious

adjective     /ˌpɜː.tɪˈneɪ.ʃəs/ US  /ˌpɝː.tənˈeɪ-/ formal
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.Strong-willed
(Definition of pertinacious adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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