1. determined or persistent
a tenacious character
Tenacious is an adjective describing someone who is very determined and who does not give up easily. Can mean to keep a firm hold of something with the determination not to let go. You can have a tenacious hold on something for example or a tenacious grip. Something tenacious perseveres over time, is persistent and not easily gotten rid of. "A tenacious rumour gripped the town for centuries."If someone is described as tinnitus or as having tenacity it is usually considered to be a positive trait.