Home › Words › U › unimprovablenessunimprovablenessunimprovableness means the quality of being unimprovable.Among words judged in Lexicurio's Arena, unimprovableness ranks #42,033 of 42,749 for Qualifying.EtymologyFrom unimprovable + -ness.nounThe quality of being unimprovable.Definitions & examples from Wiktionary (CC BY-SA 3.0).