Not proceeding from the true source, or from the source pretended; not genuine; counterfeit; false; adulterate.

plausible but false; "specious reasoning"; "the spurious inferences from obsolescent notions of causality"- Ethel Albert

Illegitimate.

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

Not legitimate; bastard; as, spurious issue.

Undesired signals present at the output of a device under test that are neither harmonics nor intermodulation products, sometimes expressed as a percentage of or decibels below the carrier.

intended to deceive; "a spurious work of art"

A situation in which an apparent relationship between two or more variables is lacking validity.