tenacity
n. uncountablen. the quality of being very determined and not giving up, even when things are difficult. It is like having a strong grip on a goal.
n. the quality of being persistent or determined; the ability to maintain a firm hold on a purpose or action despite obstacles. Often used to describe mental or emotional strength.
Her tenacity helped her finish the marathon despite the pain.
The detective's tenacity eventually led to the discovery of new evidence that had been overlooked for years.
While talent may open the initial door to opportunity, it is often sheer tenacity that determines whether an individual can sustain a career in such a competitive and volatile industry.
From tenac(ious) + -ity, from Middle French ténacité, from Latin tenācitās.
Uncountable in its abstract sense; frequently paired with the preposition 'of' or used as a subject for verbs like 'pay off'.