modified
closed, blockaded, not fit for travel, obstructed, pathless, trackless, untrodden, impenetrable, forbidden, insurmountable; see also difficult 1.
Antonyms open*, passable, traveled.
See impassable in Webster's New World Roget's A-Z Thesaurus II
Incapable of being negotiated or overcome:
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Also Mentioned In
» airlift
» aporia
» gulf
» impenetrable
» impossible
» inaccessible
» insuperable
» man-sized
» passable
» rift
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