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tenacious

adjective
 
 
/təˈneɪ.ʃəs/

Definition

holding tightly onto something, or keeping an opinion in a determined way: The baby took my finger in its tenacious little fist. There has been tenacious local opposition to the new airport.Strong-willed tenaciously
 
 
/-li/ adverb
Strong-willed
(Definition of tenacious adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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