LATIN DICTIONARYLexicon Latīnum
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“fictitious” in Latin

The English word fictitious itself goes back to Latin fingō, through fictīcius.

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

fictitious
fictus: confictus: commenticius (☞ not fictititius). Fictitious gods, dii adumbrati: dii ficti et commenticii. A fictitious case, fictio (in rhetoric, Quint.).

Quick answer

What is the Latin word for fictitious?
The usual Latin words for “fictitious” are fingō, cōnfingō, commentīcius; also fictiō. 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.