/ ˌʌnˈtʃɑːtɪd; NAmE -ˈtʃɑːrt-/ adjective [ usually before noun ]
1.
that has not been visited or investigated before; not familiar :
They set off into the country's uncharted interior.
( figurative )
The party is sailing in uncharted waters (= a situation it has not been in before) .
( figurative )
I was moving into uncharted territory (= a completely new experience) with this relationship.
2.
not marked on a map :
The ship hit an uncharted rock.