pertinacity

Have you ever tried to dig a hole all the way to China?
 * 1) Adhering resolutely to an opinion, purpose, or design. Perversely persistent.
 * 2) It followed my footsteps with a pertinacity which it would be difficult to make the reader comprehend.
 * 3) [[image:http://tailwaggers.co.za/images/dog_digging.jpg]]