say it: uhn-aw-THEN-tik
unauthentic is an adjective meaning "false or fake; not what it appears to be". It carries one recorded sense.
false or fake; not what it appears to be
“a spurious work of art”
Definitions, synonyms and semantic relations for unauthentic come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.