Unexplored
/ˌʌnɪˈksplɔrd/
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Definition
(adj) Which has not been explored.
Sentence Examples
The Sagittarius and Perseus Arms of the galaxy remained unexplored for thousands of years.
The sea bottom is still unexplored.
CEFR Practice Quiz
Many parts of the deep ocean remain ____, as it is very difficult to reach such extreme and dark depths today.