But that mild and meek man had a certain strength of pertinacity.
But she shook her head and rose—angry, which she hid, but also amused at his pertinacity.
I think I've shown that by my pertinacity in hunting you down.
But the pertinacity of that brass-bound Paul Pry was astonishing.
"I believe not," said Helen, smiling at the pertinacity of his curiosity.
Theirs was ...