spurious

Adjective

• intended to deceive
  • a spurious work of art
    

• born out of wedlock
  • the dominions of both rulers passed away to their spurious or doubtful offspring- E.A.Freeman
    

• plausible but false
  • a specious claim
    
  • spurious inferences
    

Related words

• Synonyms: 
  inauthentic , unauthentic , bastardly , misbegot , misbegotten , specious