1 adj If you are tenacious, you are very determined and do not give up easily.
He is regarded at the BBC as a tenacious and persistent interviewer.
tenaciously adv usu ADV after v
In spite of his illness, he clung tenaciously to his job.
2 adj If you describe something such as an idea or belief as tenacious, you mean that it has a strong influence on people and is difficult to change or remove.
...a remarkably tenacious belief that was to dominate future theories of military strategy.
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"