spe⋅cious
   /'spiʃəs/ Show Spelled Pronunciation [spee-shuhs] Show IPA
-adjective
1.  apparently good or right though lacking real merit; superficially pleasing or plausible: specious arguments.
2.  pleasing to the eye but deceptive.
3.  Obsolete. pleasing to the eye; fair.
This idea that we must see through what we have started is specious, however good it may sound.
Luther and the Reformers addressed the twin problem of Indulgences and Purgatory, and the specious theory behind them.