Definition of tenacious adjective from the Oxford Advanced Learner's Dictionary

     

    tenacious

     adjective
    adjective
    BrE BrE//təˈneɪʃəs//
     
    ; NAmE NAmE//təˈneɪʃəs//
     
    (formal)
     
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  1. 1that does not stop holding something or give up something easily; determined a tenacious grip She's a tenacious woman. She never gives up. The party has kept its tenacious hold on power for more than twenty years.
  2. 2continuing to exist, have influence, etc. for longer than you might expect synonym persistent a tenacious illness
  3. Word Origin early 17th cent.: from Latin tenax, tenac- (from tenere ‘to hold’) + -ious.
See the Oxford Advanced American Dictionary entry: tenacious