LATIN DICTIONARYLexicon Latīnum
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“unpardonable” in Latin

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

unpardonable
major quam cui ignosci possit (too heinous to be pardoned): quod nihil excusationis habet (inexcusable; e.g., vitium): inexpiabilis (that cannot be atoned for; e.g., scelus; fraus). A sin, therefore, is not the less unpardonable, because, etc., nulla est igitur excusatio peccati, si, etc.

Quick answer

What is the Latin word for unpardonable?
The usual Latin words for “unpardonable” are inexpiābilis, vitium, scelus; also fraus. 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.