Presenting a pleasing appearance; pleasing in form or look; showy.

Apparently right; superficially fair, just, or correct, but not so in reality; appearing well at first view; plausible; as, specious reasoning; a specious argument.

plausible but false; "specious reasoning"; "the spurious inferences from obsolescent notions of causality"- Ethel Albert

plausible but false; "a specious claim"

based on pretense; deceptively pleasing; "the gilded and perfumed but inwardly rotten nobility"; "meretricious praise"; "a meretricious argument"

an argument that seems plausible but is in fact fallacious.