- specious, spurious - plausible but false; "specious reasoning"; "the spurious inferences from obsolescent notions of causality"- Ethel Albert
Antonym: valid (indirect, via invalid)
- specious - plausible but false; "a specious claim"
Antonym: true (indirect, via false)
- gilded, meretricious, specious - based on pretense; deceptively pleasing; "the gilded and perfumed but inwardly rotten nobility"; "meretricious praise"; "a meretricious argument"
Antonym: sincere (indirect, via insincere)