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English definition of “tenacious”

tenacious

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