Longman Dictionary of Contemporary English homepage

uncharted

 adjective
     
Related topics: Geography
un‧chart‧ed
1

uncharted waters/territory/area etc

a situation or activity that you have never experienced or tried before:
This new project will take us into uncharted territory.
2SG not marked on any maps:
an uncharted island
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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