LATIN DICTIONARYLexicon Latīnum
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“falseness” in Latin

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

falseness
Want of truth, falsum (☞ falsitas first in Arnobius, 1, 33).
Want of uprightness, fraus (deceit): fallacia (cheating, imposture; hence, also, falsehood): dolus (mischievous cunning): perfidia (faithlessness).

Quick answer

What is the Latin word for falseness?
The usual Latin words for “falseness” are fallō, fraus, fallāx; also dolor, perfidia. 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.