untraversable Synonyms

dense unbridgeable unbreachable unclimbable unnavigable unscalable unachievable unattainable uncrossable untravellable be unnavigable intransitable unapproachable unpassable uncontrollable formidable impassable impenetrable impervious impracticable inaccessible insurmountable overgrown thick thickset unconquerable be unpassable