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Douglas Harper's Etymology Dictionary
Panglossian

"optimistic" (usually ironic or disparaging), 1831, from French Panglosse, name of the philosopher and tutor in Voltaire's "Candide" (1758), from pan- (see pan-) + Greek glossa, literally "tongue" (see gloss (n.2)).

Usage examples of "panglossian".

I am not arguing against law, I add as they scribble in furious confusion, but against the Panglossian assumption that we can ever do law particularly well.

When the dogmas about Islam cannot serve, not even for the most Panglossian Orientalist, there is recourse to an Orientalized social-science jargon, to such marketable abstractions as elites, political stability, modernization, and institutional development, all stamped with the cachet of Orientalist wisdom.

He was quite disembarrassed of that Panglossian philosophy which had hitherto induced him to believe that the Earl of Fitz-pompey was the best of all possible uncles.