The quality or state of being stubbornly unyielding
They fought with more pertinacity than bulldogs.
In the end the pertinacity of John triumphed.
This pertinacity engendered a belief in France that Italy was about to undertake in Tunisia a more aggressive policy than necessary for the protection of her commercial interests.
Extreme as were his principles, his pertinacity in adhering to them and his independence of expression were quite as extreme.
Enghien's pertinacity had not achieved a decision with the sword, but Mercy had been so severely punished that he was unable to interfere with his opponent's new plan of campaign.