Source : Webster's Revised Unabridged Dictionary (1913)

Pathless \Path"less\, a.
   Having no beaten path or way; untrodden; impenetrable; as,
   pathless woods.

         Trough the heavens' wide, pathless way.  --Milton.

Source : WordNet®

pathless
     adj : lacking pathways; "trackless wilderness"; "roadless areas"
           [syn: {roadless}, {trackless}, {untracked}, {untrod}, {untrodden}]