LATIN DICTIONARYLexicon Latīnum
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“faithlessness” in Latin

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

faithlessness
perfidia (faithlessness, treacherousness; deliberately violating the obligations by which a person is bound toward anybody): infidelitas (faithlessness toward anybody to whom one was bound to be true; thus, Labienus infidelitatem ejus sine ulla perfidia judicavit comprimi posse, Hirt., B.G., 8, 23). To be guilty of faithlessness; Vid: “to break one’s FAITH.

Quick answer

What is the Latin word for faithlessness?
The usual Latin words for “faithlessness” are perfidia, īnfidēlitās. 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.