Zamenhof coined this word, but I don't understand how he came up with it. I only find it similar to pig in English and gras (fat) in French, but it is maybe accidental.
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According to Wiktionary, it comes from the Italian word pigro, whose feminine form is exactly the same as the Esperanto pigra. The Italian word in turn comes from the Latin word piger.
answered Oct 29, 2016 at 14:18
