Adjective
unattested (comparative more unattested, superlative most unattested)
Not supported by attestation; lacking supporting evidence in the form of assurance from an authority.
Nothing unattested do I sing. Callimachus
Grimm took Forseti, "praeses", to be the older form of the name, first postulating an unattested Old High German equivalent *forasizo (cf. modern German Vorsitzender "one who presides"). Source: Internet
Pascal innovated many previously unattested uses of the triangle's numbers, uses he described comprehensively in what is perhaps the earliest known mathematical treatise to be specially devoted to the triangle, his Traité du triangle arithmétique (1653). Source: Internet
Maddicott, p. 50 Patrick Wormald was also sceptical, describing 'witena-gemot' as "a word always rare and unattested before 1035". Source: Internet
Origin and etymology There are competing theories of where and when troll was first used in Internet slang, with numerous unattested accounts of BBS and UseNet origins in the early 1980s or before. Source: Internet
The source of the West Greek speakers in the Peloponnesus remains unattested by any solid evidence. Source: Internet