adjective
1.
worthy of acceptance because of accuracy
an authentic portrayal of ancient customs
Synonyms: convincing, credible, faithful, trustworthy, trusty
Related Word: accurate, dependable, factual, reliable, sure; solid, sound, straight, valid; authoritative, cathedral, official, standard
Idioms: all wool and a yard wide; to be depended ( or relied) on
Contrasted words: incredible, unconvincing, untrustworthy; equivocal, obscure, uncertain, vague; hypothetical, purported, putative, supposed, supposititious; debatable, doubtful, questionable; nonstandard
Antonyms: inauthentic
2.
being exactly as appears or is claimed
an authentic masterpiece
Synonyms: blown-in-the-bottle, bona fide, genuine, indubitable, pukka, questionless, real, right, simon-pure, sure-enough, true, undoubted, undubitable, unquestionable, veritable, very
Related Word: cognizable, identifiable, knowable, recognizable; honest, pure, unadulterated, unalloyed
Contrasted words: deceptive, delusive, delusory, false, misleading, wrong; unidentifiable, unrecognizable
Antonyms: spurious
3.
Synonyms: certain 3, accurate, dependable, reliable