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Adjective: spurious  spyûr-ee-us
  1. Ostensibly valid, but not actually valid
    "a spurious argument"
  2. Plausible but false
    "spurious inferences";
    - specious
  3. False or fake; not what it appears to be
    "a spurious work of art";
    - inauthentic, unauthentic
  4. [archaic] Born out of wedlock
    "the dominions of both rulers passed away to their spurious or doubtful offspring";
    - bastardly [archaic], misbegot [archaic], misbegotten [archaic]

See also: counterfeit, false, illegitimate, imitative, invalid

Encyclopedia: Spurious