impassable
Adjective
Meaning
Incapable of being passed; not admitting a passage; as, an impassable road, mountain, or gulf.
Source: Webster's dictionarySynonyms
Antonyms
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Examples
After a few days' travel they soon discovered that steep canyons, waterfalls and impassable rapids made travel by river impossible.
Both rapids were considered virtually impassable.
During the rainy season from July to October, some roads are impassable.
Flooding during the April to December rainy season occasionally makes city streets impassable and washes out some roads in the interior of the country.
Hardin (1994), p. 245. Spring rains ruined the ammunition and rendered the roads almost impassable, with troops sinking to their knees in mud.
He crossed without opposition over both the Apennines (during which he lost his right eye citation because of conjunctivitis ) and the seemingly impassable Arno, but he lost a large part of his force in the marshy lowlands of the Arno.