LATIN DICTIONARYLexicon Latīnum
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“insincerity” in Latin

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

insincerity
fraus (deceit; opposed to veritas, Cic., Lael. 24, 89): ambigua fides (Liv., 6, 2): ingenium ambiguum (Plin., not trustworthy): infidelitas (unfaithfulness; where fidelity or truth is justly expected; friendships, quarum infidelitatem extimescebat; infidelitatis suspicionem sustinere, Caes., B.C., 2, 33): *ingenium parum simplex (apertum, ingenuum, etc.). He is made up of insincerity, nihil apparet in eo ingenuum; ex fraude totus constare videtur. Vid. DECEIT, DISSIMULATION.

Quick answer

What is the Latin word for insincerity?
The usual Latin words for “insincerity” are fraus, īnfidēlitās, aperiō; also ingenuus. 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.