spurious

adjectives

plausible but false
"a specious claim"; "spurious inferences"
specious, spurious
is derived from
spuriousness
born out of wedlock
"the dominions of both rulers passed away to their spurious or doubtful offspring"- E.A.Freeman
bastardly, misbegot, misbegotten, spurious
intended to deceive
"a spurious work of art"
inauthentic, spurious, unauthentic
is derived from
spuriousness