LATIN DICTIONARYLexicon Latīnum
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“sincere” in Latin

The English word sincere itself goes back to Latin sincērus.

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

sincere
sincerus: simplex: candidus: A sincere man, homo apertae voluntatis, simplicis ingenii: veritatis amicus. SYN. in SINCERITY.

Quick answer

What is the Latin word for sincere?
The usual Latin words for “sincere” are sincērus, simplex, candidus. 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.