unpassable

Synonyms:

impassable

unclimbable, unsurmountable

incapable of being surmounted or climbed

unnavigable

incapable of being navigated

untraversable

incapable of being traversed

Antonyms:

passable

able to be passed or traversed or crossed

navigable

able to be sailed on or through safely

negotiable

capable of being passed or negotiated

climbable, surmountable

capable of being surmounted

travelable, traversable

capable of being traversed

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