Mid 19th century; earliest use found in Henry Manning (1808–1892), Roman Catholic convert and cardinal-archbishop of Westminster. From nonentity + -ous.
Definition of non-entitous in US English:
non-entitous
adjectivenɒnˈɛntɪtəs
rare
= non-entitious.
Origin
Mid 19th century; earliest use found in Henry Manning (1808–1892), Roman Catholic convert and cardinal-archbishop of Westminster. From nonentity + -ous.