Home › Words › S › sinewlessnesssinewlessnesssinewlessness means absence of sinews.Among words judged in Lexicurio's Arena, sinewlessness ranks #41,780 of 42,762 for Qualifying.EtymologyFrom sinewless + -ness.nounAbsence of sinews.Definitions & examples from Wiktionary (CC BY-SA 3.0).