supposititious

/səˌpɑzɪˈtɪʃəs/
adjective
  1. Falsely presented as genuine or real; not authentic.
    • The letter was supposititious, written by someone pretending to be the author.
    • The museum discovered that the ancient vase was supposititious, a clever modern copy.
    • He claimed to be a doctor, but his credentials were supposititious.
What does "supposititious" mean? | whatsthatwordmean | whatsthatwordmean