Synonyms for Authentic:

adj.

all (adjective)
reliable, veritable, bona fide, unquestionable.
authoritative (adjective)
proven.
earliest (adjective)
original.
evidential (adjective)
demonstrated, substantiated, validated, counter-evidential, Vouched, Testified, confirmed, corroborated, supported, Exhibited, evidential, certified, proven, established, documented, Exemplified, witnessed.
literal (adjective)
actual, explicit, accurate, literal, exact, overt, prosaic, verbatim, precise.
original (adjective)
ingenious, novel, original, genuine, first, innovative, unique, prototypical, creative, initial.
persuasive (adjective)
convincing.
precise (adjective)
accurate.
real (adjective)
veritable, concrete, real, factual, honest, sincere, solid, genuine, actual, tangible, substantial, true.
real, genuine (adjective)
true, faithful, official, convincing, accurate, actual, valid, bona fide, credible, trustworthy, original, veritable, reliable, certain, trusty, factual.
reliable (adjective)
trustworthy, official.
true (adjective)
certain, axiomatic, gospel, right, absolute, definite, honest, true, veracious, factual, proven.
undisputed (adjective)
undoubted.
veracious (adjective)
genuine, ingenuous, correct, true, honest, veracious, factual, accurate.

n.

specific, unerring, perfect. credible, objective, physical, valid, convincing, kosher, realistic, real world, apparent, faithful. indubitable, undoubted, good. authentic (noun)
echt, genuine, bona fide, unquestionable, trusty, veritable, trustworthy, reliable.
genuine (noun)
study at.

Other synonyms:

objective, realistic, apparent, physical. kosher, undoubted, indubitable. credible, faithful, convincing. good. genuine
valid.
Other relevant words:
unerring, unquestionable, convincing, undoubted, valid, trusty, indubitable, credible, faithful, kosher, physical, official, reliable, specific, bona fide, good, echt, trustworthy, perfect, realistic.

Usage examples for authentic

  1. Mr. Pole seemed a man of integrity, and it was clear that the churchman believed the discovery to be genuine and authentic – Mark Twain, A Biography, 1835-1910, Complete The Personal And Literary Life Of Samuel Langhorne Clemens by Albert Bigelow Paine Last Updated: February 20, 2009