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Specious (adjective)
Seemingly well-reasoned, plausible or true, but actually fallacious.
“fallacious|insincere”
“This idea that we must see through what we have started is specious, however good it may sound.”
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Specious (adjective)
Employing fallacious but deceptively plausible arguments; deceitful.
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Specious (adjective)
Having an attractive appearance intended to generate a favorable response; deceptively attractive.
“meretricious|pretextual”
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Specious (adjective)
Beautiful, pleasing to look at.
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Spurious (adjective)
false, not authentic, not genuine
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Spurious (adjective)
bastardly, illegitimate
Wiktionary