undiscovered

From un- +‎ discovered.

undiscovered (not comparable)

1. That has not been discovered; unknown, unexplored.
   • 1850, [Alfred, Lord Tennyson], “Canto XXXIX”, in In Memoriam, London: Edward Moxon, […], →OCLC, page 61:

     ⁠But thou and I have shaken hands,
     ⁠Till growing winters lay me low;
     ⁠My paths are in the fields I know,
     And thine in undiscover’d lands.

From undiscover +‎ -ed.

undiscovered

1. simple past and past participle of undiscover