Big Huge Thesaurus

unpassable

adjective

• impassable

antonyms

• passable

similar terms

• unclimbable
• unnavigable
• unsurmountable
• untraversable

sounds kind of like

• unappeasable
• unfeasible
• unimpeachable
• unimpeachably
• unnavigable
• unopposable
• unpeaceable
• unpeaceful