Antonyms of adj unauthentic

1 sense of unauthentic

Sense 1
inauthentic, unauthentic, spurious -- (intended to deceive; "a spurious work of art")

INDIRECT (VIA counterfeit) -> genuine, echt -- (not fake or counterfeit; "a genuine Picasso"; "genuine leather")

Similarity of adj unauthentic

1 sense of unauthentic

Sense 1
inauthentic, unauthentic, spurious -- (intended to deceive; "a spurious work of art")
       => counterfeit (vs. genuine), imitative -- (not genuine; imitating something superior; "counterfeit emotion"; "counterfeit money"; "counterfeit works of art"; "a counterfeit prince")