Fabled means famous in stories, and perhaps not quite real. The fabled city, a fabled treasure, fabled beasts.
The doubt is the useful part: calling something fabled says it is famous and quietly declines to say it exists — which is why explorers' accounts and travel writing reach for it. Of something real it means legendary. Note fable, from the Latin for a story.
1adjectivefabledFamous in stories, and perhaps not quite real.
“Explorers searched for the fabled city of gold for centuries but never found it.”
fabled is a quality of legend.
Proto-Indo-European
*bʰeh₂-
Latin
fābula
Old French
fable
English
fable
English, today
fabled
Built from
fable comes from Middle English -, borrowed from Old French fable, from Latin fābula, from for (“to speak, say”) + -bula (“instrumental suffix”). See ban, and compare fabulous, fame. a doublet of fabula.
Etymology from Wiktionary, CC BY-SA