Impassable
/ˌɪˈmpæsəbəl/
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Definition
(adj) Incapable of being passed over, crossed, or negotiated.
Sentence Examples
There were white out conditions in the town; subsequently, the roads were impassable.
The river is impassable.
CEFR Practice Quiz
The heavy winter snowstorm made the mountain roads completely ____ for several days.