Synonyms for Unpassable:

• n.

  •Other relevant words: (noun)
  • impassable.
  •unclimbable (noun)
  • unclimbable.
  •unnavigable (noun)
  • unnavigable.
  •unpassable (noun)
  • unsurmountable,
  • untraversable.

• Other synonyms:

  •Other relevant words (noun):
  • impenetrable,
  • impermeable,
  • impervious.

Antonyms for Unpassable:

• adj.

  • Other antonyms:
    passable.