That has not yet been discovered; unexplored.(adjective)
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Use "undiscovered" in a sentence
"A third method of divining big moves, an untraditional one I would like to think I have helped pioneer myself, comes from examining a different, unexploited cohort, which I call the undiscovered stocks of unknown companies."
"I believe the orang pendek is a great ape closely related to the orang-utan – in other words an undiscovered species of ponginae."
"What must it be like for the Tyonek people whose ancestors 'bones still lie in undiscovered burial grounds in this soil - in this "lease area", and whose very lives depend on the subsistence harvest of fish, and game, and berries just like those ancestors have done for thousands of years?"