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English definition of “tenacious”

tenacious

adjective [not gradable]  /təˈneɪ·ʃəs/ us  
unwilling to accept defeat or stop doing or having something: Seles is a tenacious opponent – she never gives in.
tenacity
noun [U]  /təˈnæs·ɪ·t̬i/ us  
They cling with admirable tenacity to their traditions.
(Definition of tenacious from the Cambridge Academic Content Dictionary © Cambridge University Press)
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