Spurious, a.
Etymology: [L. spurius.]
1. Not proceeding from the true source, or from the source pretended; not genuine; false; adulterate.
2. Not legitimate; bastard; as, spurious issue. "Her spurious firstborn." Milton. Spurious primary, or Spurious quill (Zoöl.), the first, or outer, primary quill when rudimentary or much reduced in size, as in certain singing birds. -- Spurious wing (Zoöl.), the bastard wing, or alula.
Syn. -- Counterfeit; false; adulterate; supposititious; fictitious; bastard. -- Spu"ri*ous*ly, adv. -- Spu"ri*ous*ness, n.
Shades of meaning
Fernald lists spurious only as an antonym, under authentic.
He lists it without comment; the entries above explain its neighbors.
Synonyms
none given