SPECIOUS

seeming true but actually being fallacious

misleadingly attractive

plausible but false
/SYN - spurious
"a specious claim"

based on pretense
SYN - gilded, meretricious
ANT - true

"He was a master at fooling these saps with specious arguments such as these."

"It was a specious proposal which they knew not to accept."

"It was a specious statement intended to strike an emotional chord with his audience, but it backfired since his rival was quick to show just how misleading and false the claim was."