pertinacity

But in the end Buck’s pertinacity was rewarded; for the wolf, finding that no harm was intended, finally sniffed noses with him.

In many ways, he was like a north star, his effervescent personality and endearing pertinacity emitting a guiding light through the sport’s most transitional times.

Mr. Trump made it clear that the Supreme Court decision would not slow a post-campaign campaign, the futility of which has dampened neither its ferocity nor its pertinacity.

Well-practiced in the art of pertinacity, he shrugs at the memory of his demotion, writing it off as another lesson from which to learn.

While this pertinacity draws its share of detracts, it also helped the Englishman force his way into a favorable -- and likely, proper -- ruling at the PGA Championship.