LATIN DICTIONARYLexicon Latīnum
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“heinous” in Latin

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

heinous
nefarius: immanis: foedus: flagitiosus: atrox (e.g., facinus, Liv.). Heinous crimes, scelera; flagitia: nefaria (adjective): the most heinous crimes, rlagitiosissima facinora (Sall.).

Quick answer

What is the Latin word for heinous?
The usual Latin words for “heinous” are nefārius, immānis, foedus; also flāgitiōsus, atrōx, facinus. 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.