LATIN DICTIONARYLexicon Latīnum
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“unprecedented” in Latin

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

unprecedented
unicus: singularis (unique of its kind): novus (new): inauditus (unheard of): novus et inauditus: inauditus et novus. He replies that to allow anybody to march through a Roman province would be quite unprecedented, negat se more et exemplo populi Romani posse iter ulli per provinciam dare (Caes..).

Quick answer

What is the Latin word for unprecedented?
The usual Latin words for “unprecedented” are ūnicus, singulāris, novus; also inaudītus. 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.