Witty, humorous, or cleverly amusing in a light and playful way; facetious (archaic or formal usage).
From Latin 'facetus', meaning witty or elegant. Entered English through learned/literary sources, related to the Latin root meaning to jest or make jokes.
The word 'facete' is so old-fashioned that almost nobody uses it anymore, but it's the direct ancestor of 'facetious'—watching a word evolve from formal Latin to casual modern English shows how language simplifies over centuries!
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