Home › Words › U › unbrotherlinessunbrotherlinessunbrotherliness means the state or condition of being unbrotherly.Among words judged in Lexicurio's Arena, unbrotherliness ranks #16,730 of 42,749 for Qualifying.EtymologyFrom unbrotherly + -ness.nounThe state or condition of being unbrotherly.Definitions & examples from Wiktionary (CC BY-SA 3.0).