pertinacious \puhr-tin-AY-shuhs\, adjective:
1. Holding or adhering obstinately to any opinion, purpose, or design.
2. Stubbornly or perversely persistent.
The cabman replied: "If you will excuse me, your coat lapels are badly twisted downward, where they have been grasped by the pertinacious New York reporters."
-- David Walton, "Sherlock Holmes's Maker", New York Times, May 2, 1999