Undiscovered
/ˌʌndɪˈskʌvərd/
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Definition
(adj) That has not been discovered; unknown, unexplored.
Sentence Examples
It is thought that Algeria still has lots of undiscovered oil resources.
Ziri wanted to explore the undiscovered areas of the Amazon with Rima.
CEFR Practice Quiz
The cave system contains many ____ passages that have never been explored by humans before this trip today.