WordWeb Online

1. Plausible but false
   "spurious inferences"
   - specious
    
2. Born out of wedlock
   "the dominions of both rulers passed away to their spurious or doubtful offspring"
   - bastardly, misbegot, misbegotten
    
3. Intended to deceive
   "a spurious work of art"
   - inauthentic, unauthentic

See also: counterfeit, false, illegitimate, imitative, spuriously, spuriousness

Encyclopedia: Spurious