I'm looking for a word that means without a source but that is a little shorter and simple than sourceless. Coulnd't find any on Thesaurus.
English Language & Usage Stack Exchange is a question and answer site for linguists, etymologists, and serious English language enthusiasts. It only takes a minute to sign up.Sign up to join this community
here is a suggestion:
aseity - the quality or state of being self-derived or self-originated
or try groundless or just source-less if it gets complicated.
I'm a bit prejudiced to the concept of fons et origo but a hapax legomenon is a term of which only one instance of use is recorded and anything without an origin is cryptogenic or a term that refers to something of obscure or unknown origin.