Superficially plausible

• Apparently right, but not really so
• Superficially misleading issue cop sorted out
• Plausible but untrue
• Deceptively convincing
• Convincing at first, but flawed

Wiktionary Word definitions in Wiktionary
a. 1 Seemingly reasoned, plausible or true, but actually fallacious. 2 Having an attractive appearance intended to generate a favorable response; deceptively attractive. 3 (context obsolete English) beautiful, pleasing to look at.

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
adjective EXAMPLES FROM OTHER ENTRIES ▪ specious logic EXAMPLES FROM CORPUS ▪ All that is needed is a positive approach and an end to the specious fear of isolation. ▪ Even so, the size-and-weight-of-head argument is a rather specious one. ▪ In the history ...

Wikipedia Word definitions in Wikipedia