LATIN DICTIONARYLexicon Latīnum
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“sin” in Latin

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

sin s.
peccatum (opposed to rectum, virtus): delictum (opposed to recte factum): ☞ Cic. uses peccatum and delictum as synonymous; fatetur aliquis se peccasse, et ejus delicti veniam petit, Mur., 30, 62): flagitium (a base deed): nefas (an unnatural, impious, horrible offence). To commit a sin, peccare; delinquere; peccatum, delictum, nefas admittere; delictum committere: to live in sin, impie or flagitiose vivere: sin is the fruitful source of misery, nihil est, quod tam miseros faciat, quam impietas et scelus (Cic.).
sin v.
Vid: the substantive, ad fin.

Quick answer

What is the Latin word for sin?
The usual Latin words for “sin” are peccō, dēlinquō, flāgitium; also nefās, virtūs. 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.