That has not been traversed; unexplored.(adjective)
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Use "untraversed" in a sentence
"When the playing field is the worldwide internet and today's trailblazers can just as easily become tomorrow's forgotten url, Phair's dedication to continued excellence anchors The Outnet firmly in untraversed waters."
"A mathematician has left an untraversed gap whenever he has not tried to verify directly that each proposition in the sequence of propositions that he has in mind (as being a proof) follows from previous propositions in the sequence by a basic mathematical inference"
"But, besides attending to such cases as the village may afford, he is day and night at the service of every one who may command his assistance within a circle of forty miles in diameter, untraversed by roads in many directions, and including moors, mountains, rivers, and lakes."