Definitions of spurious:

• adjective:   plausible but false

  Example: "The spurious inferences from obsolescent notions of causality- Ethel Albert"

• adjective:   intended to deceive

  Example: "A spurious work of art"

• adjective:   born out of wedlock

  Example: "The dominions of both rulers passed away to their spurious or doubtful offspring- E.A.Freeman"