Home › Words › U › unpassablenessunpassablenessunpassableness means the quality of being unpassable.Among words judged in Lexicurio's Arena, unpassableness ranks #36,606 of 42,747 for Qualifying.EtymologyFrom unpassable + -ness.nounThe quality of being unpassable.Definitions & examples from Wiktionary (CC BY-SA 3.0).