179. Indefatigable

From, “Past Imperfect. Paris or Bust: The Great New York-to-Paris Auto Race of 1908,” by Karen Abbott, 3/7/12, Smithsonian.com:

Professional driver Harold Brinker, famous for surviving a crash the previous year that had killed another driver, would take command in Ogden. George Schuster, the indefatigable mechanic, would drive through Alaska and Siberia, and Roberts would return when the car neared Europe.

Indefatigable: persisting tirelessly; untiring