Part of speech:
Rare; not common or usual
Characteristic only of a particular category or entity:
Just found, discovered, or learned:
Employed or used for a special service, function, or occasion:
Strikingly new, unusual, or different.
Out of sight; hidden:
Extremely unusual or unconventional; extraordinary:
Unusually good; excellent
Not previously known, seen, heard, or experienced; unfamiliar
Not to be believed; incredible:
Left unnamed; anonymous
Find another word for unheard-of. In this page you can discover 20 synonyms, antonyms, idiomatic expressions, and related words for unheard-of, like: uncommon, unprecedented, unique, new, unknown, unusual, extraordinary, novel, obscure, outrageous and rare.