"specious" in the adjective sense
1. specious, spurious
plausible but false
"a specious claim"
"spurious inferences"
2. gilded, meretricious, specious, glossy
based on pretense deceptively pleasing
"the gilded and perfumed but inwardly rotten nobility"
"meretricious praise"
"a meretricious argument"
Source: WordNet® (An amazing lexical database of English)
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