impassable Synonyms

unpassable undefeatable deadend unbeatable unattackable all-conquering nonopening tightly packed no-go watertight bulletproof unbridgeable unapproachable airtight unsurmountable unnavigable unreachable unscalable unpiercable without exit without egress leading nowhere closed at one end untrodden untraversable untravellable unrealizable unpierceable uninjectable unfeasible unattainable unachievable unpenetrable obstructed impracticably impracticable impossible imporous impervious imperviable impermeable impenetrable impassive dogged dense compact closed blockaded impregnable inaccessible