tenaciousness

Reivers with more than human tenaciousness had retained a glimmer of consciousness.

The fault of literary conversation in general is its too great tenaciousness.

"Certainly, sir, you are gifted with tenaciousness," cried the captain.

The tenaciousness of flowers is not known; their hardihood is not sufficiently admired.

I only wished to see you roused from your low spirits, and yet I add to them by my foolish tenaciousness.