LATIN DICTIONARYLexicon Latīnum
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“impiety” in Latin

The English word impiety itself goes back to Latin pius, through impietas.

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

impiety
impietas (want of reverence and love for God, etc; also for one’s country, parents, etc.): Dei (or, according to Roman notions, deūm) negligentia: divini cultūs negligentia (neglect of God and religious worship). An impiety, nefas: scelus: res scelesta or nefaria.

Quick answer

What is the Latin word for impiety?
The usual Latin words for “impiety” are impietās, deus, nefās; also scelus, nefārius. 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.