Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb authenticate

1 sense of authenticate

Sense 1
authenticate -- (establish the authenticity of something)
       => attest, certify, manifest, demonstrate, evidence -- (provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes; "His high fever attested to his illness"; "The buildings in Rome manifest a high level of architectural sophistication"; "This decision demonstrates his sense of fairness")

Antonyms of adj authenticated

1 sense of authenticated

Sense 1
attested, authenticated, documented -- (established as genuine)

INDIRECT (VIA genuine) -> counterfeit, imitative -- (not genuine; imitating something superior; "counterfeit emotion"; "counterfeit money"; "counterfeit works of art"; "a counterfeit prince")

Similarity of adj authenticated

1 sense of authenticated

Sense 1
attested, authenticated, documented -- (established as genuine)
       => genuine (vs. counterfeit), echt -- (not fake or counterfeit; "a genuine Picasso"; "genuine leather")