Synonyms of 'uncharted'
Unchartered is sometimes mistakenly used where uncharted is meant: We did not want to pioneer in completely uncharted (not unchartered) territory.
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A strange place is one that you have never been to before. A strange person is someone that you have never met before.
I ended up alone in a strange city.
If something is unfamiliar to you, you know nothing or very little about it, because you have not seen or experienced it before.
She grew many plants that were unfamiliar to me.
Thesaurus for uncharted from the Collins English Thesaurus
If you describe a situation , experience , or activity as uncharted territory or waters , you mean that it is new or unfamiliar .