"spurious" in the adjective sense
1. spurious
ostensibly valid, but not actually valid
"a spurious argument"
2. specious, spurious
plausible but false
"a specious claim"
"spurious inferences"
3. bastardly, misbegot, misbegotten, spurious
born out of wedlock
"the dominions of both rulers passed away to their spurious or doubtful offspring"- E.A.Freeman
4. inauthentic, unauthentic, spurious
false or fake not what it appears to be
"a spurious work of art"
Source: WordNet® (An amazing lexical database of English)
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