unverifiable (adjective) legendary: fictitious but well known
Sinonime: allegorical,
apocryphal, created,
customary,
doubtful,
dubious, fabled, fabricated,
fabulous,
fanciful, figmental, handed-down,
imaginary,
imaginative,
improbable, invented,
mythical, mythological,
related,
romantic, storied, told,
traditional, unhistoric, unhistorical,
unreal, unverifiable
Antonime: factual,
real,
true