tenacious
tuh-NAY-shusadjMeaning holding on firmly; refusing to give up
Memory hook holds on with all TEN fingers. The wind howls around the cliff, but Maya holds on with all ten fingers and keeps climbing: she is tenacious.
The tenacious terrier would not let go of the rope toy.
In context Most reporters gave up after the mayor’s office ignored their calls, but one tenacious young writer kept asking questions for months until she got answers.
Similar persistent, determined, dogged, unrelenting
Opposite irresolute, wavering, weak
From Latin tenax, “holding fast,” from tenere (to hold).