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What at first appeared to be intelligent, but later is determined to be just dumb.

Can apply to a person, conversation or an idea.
TM: It totally sucks when you try to have an intelligent conversation with someone you are led to believe is intelligent, but are sadly disappointed when you discover they are not as intelligent as they portrayed.

BA: We call those Fauxtelligent conversations.
by Aequitarum Custos July 26, 2011