trackless

/ˈtrækləs/
adjective
  1. Having no path or trail; without a track or route.
    • The desert stretched out as a trackless expanse of sand.
    • The explorers ventured into trackless wilderness.
    • They hiked through a trackless forest with no marked trails.
  2. Not running on rails or tracks; used especially of vehicles.
    • The city introduced trackless trains for the park tour.
    • Trackless vehicles are more flexible than trains.
    • A trackless trolley uses overhead wires but no rails.
Antonyms
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