Home › Words › U › unthriftinessunthriftinessunthriftiness means the quality of being unthrifty.Among words judged in Lexicurio's Arena, unthriftiness ranks #32,281 of 42,749 for Qualifying.EtymologyFrom unthrifty + -ness.nounThe quality of being unthrifty.Definitions & examples from Wiktionary (CC BY-SA 3.0).