LATIN DICTIONARYLexicon Latīnum
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“unheard of” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

unheard of
inauditus: novus (new). (The words are found in this connection and order.) inauditus ante hoc tempus ac novus: portenti similis (strange, rare in the highest degree, almost miraculous). Sulla, after the victory, displayed the most unheard of cruelty, Sulla post victoriam audito fuit crudelior: that is a thing unheard of, nullum hujus facti simile.
Untried; his defence not listened to; Vid: UNTRIED.

Quick answer

What is the Latin word for unheard of?
The usual Latin words for “unheard of” are inaudītus, novus, Sulla. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.