See authentic in American Heritage Dictionary 4 Synonyms
authentic , bona fidegenuine real 1true undoubted unquestionable
These adjectives mean not counterfeit or copied: an authentic painting by Corot; a bona fide transfer of property; genuine crabmeat; a real diamond; true courage; undoubted evidence; an unquestionable antique.
Antonym: counterfeit
See authentic in Webster's New World Roget's A-Z Thesaurus II
adjective
Worthy of belief, as because of precision or faithfulness to an original:
authoritative, convincing, credible, faithful, true, trustworthy, valid. See trueNot counterfeit or copied:
actual, bona fide, genuine, good, indubitable, original, real, true, undoubted, unquestionable. See true
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