pertinacity

Marlborough had formerly made himself conspicuous by the keenness and pertinacity with which he had attacked the Dutch.

And he kept it up all through the long vacation with a pertinacity I should never have given him credit for.

The former still adhered, with fixed pertinacity of purpose, to the matrimonial arrangement which he had made with his son.

She, it may be remembered, sought for the precious remains with true pertinacity till she found them.

Their courage and pertinacity are unconquerable, and are often sublimed into the most inconceivable rage and fury.