Home › Words › S › somniferousnesssomniferousness/sɒmˈnɪ.fəɹ.əs.nəs/somniferousness means the property of being somniferous.Among words judged in Lexicurio's Arena, somniferousness ranks #36,608 of 42,749 for Qualifying.somniferousness is pronounced /sɒmˈnɪ.fəɹ.əs.nəs/.EtymologyFrom somniferous + -ness.nounThe property of being somniferous.e.g.“[…] that destroyed somniferousness […]” — 1882 October 4, Messenger and Examiner, volume 3, page 1:Definitions & examples from Wiktionary (CC BY-SA 3.0).