LATIN DICTIONARYLexicon Latīnum
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“deceitful” in Latin

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

deceitful
ad fallendum instructus; fraudulentus: fallax (prone to deceive craftily): dolosus (full of deceit, all both of persons and things): vafer (sly): veterator (grown old in deceit): vanus (empty; of things; e.g., hopes, spes): deceitful words, verba ad fallendum instructa.

Quick answer

What is the Latin word for deceitful?
The usual Latin words for “deceitful” are fraudulentus, fallāx, dolōsus; also vafer, veterātor, vānus. 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.