SPURIOUS
inauthentic, unauthentic, spurious
(adjective) false or fake; not what it appears to be; “a spurious work of art”
bastardly, misbegot, misbegotten, spurious
(adjective) born out of wedlock; “the dominions of both rulers passed away to their spurious or doubtful offspring”- E.A.Freeman
specious, spurious
(adjective) plausible but false; “a specious claim”; “spurious inferences”
spurious
(adjective) ostensibly valid, but not actually valid; “a spurious argument”
Source: WordNet® 3.1
Etymology
Adjective
spurious (comparative more spurious, superlative most spurious)
False, not authentic, not genuine.
Extraneous; stray; not relevant or wanted.
(archaic) bastardly, illegitimate
Synonyms
• (false): counterfeit, fake, false, bogus
• See also fake
• See also illegitimate
Antonyms
• (false): genuine, representative
Source: Wiktionary
Spu"ri*ous, a. Etym: [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.
Source: Webster’s Unabridged Dictionary 1913 Edition