tenacious Meaning in the Cambridge English Dictionary
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Meaning of “tenacious” in the English Dictionary

"tenacious" in British English

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uk   us   /təˈneɪ.ʃəs/
holdingtightly onto something, or ​keeping an ​opinion in a ​determined way: The ​baby took my ​finger in ​its tenacious little ​fist. There has been tenacious ​localopposition to the new ​airport.
adverb uk   us   /-li/
(Definition of tenacious from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"tenacious" in American English

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tenaciousadjective [not gradable]

 us   /təˈneɪ·ʃəs/
unwilling to ​acceptdefeat or ​stop doing or having something: Seles is a tenacious ​opponent – she never gives in.
noun [U]  us   /təˈnæs·ɪ·t̬i/
They ​cling with ​admirable tenacity to ​theirtraditions.
(Definition of tenacious from the Cambridge Academic Content Dictionary © Cambridge University Press)
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