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“authentic, authentical” in Latin

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

authentic, authentical
fide dignus: certus: verus. Sometimes genninus: sincerus. An authentic edition, editio sincera (opposed to editio, adulterina: genuinus, from geu, root of gigno, intimates that the thing really proceeds from the source pretended; e.g., genuina Plauti fabula: sincerus = unadulterated).

Quick answer

What is the Latin word for authentic, authentical?
The usual Latin words for “authentic, authentical” are certus, vērus, sincērus; also adulterīnus, genuīnus. 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.