Definition of untraversable in English:

untraversable

Syllabification: un·tra·vers·a·ble
Pronunciation: /ˌəntrəˈvərsəbəl
 
/

adjective

Impossible to travel across or through: an untraversable six-lane stream of traffic

Definition of untraversable in:

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Word of the day neoteny
Pronunciation: nēˈätn-ē
noun
retention of juvenile features in the adult animal