specious

Adjective

• based on pretense; deceptively pleasing
  • the gilded and perfumed but inwardly rotten nobility
    
  • meretricious praise
    
  • a meretricious argument
    

• plausible but false
  • a specious claim
    
  • spurious inferences
    

Related words

• Synonyms: 
  gilded , meretricious , spurious