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“denier” in Latin

The English word denier itself goes back to Latin decem, through dēnārius.

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

denier
qui negat, recusat, etc.: qui infitias it; infitiator (especially one who denies a debt): cf., repudiator and negator, very late: a denier of his Maker, repudiator Creatoris (Tert.), negator (Tert., Prudent., etc.).
denier
nummus: not a denier, ne nummum quidem.

Quick answer

What is the Latin word for denier?
The usual Latin words for “denier” are recūsō, īnfitior, repudiō; also negō, nummus. 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.