nonsense, gobbledygook, galimatias
“Voilà qui est déjà bien obscur. Les vers suivants sont absolument incompréhensibles. C’est du pur galimatias.” — This is already very obscure. The following lines are absolutely incomprehensible. They are pure gibberish.
Unknown, first attested in Michel de Montaigne (1580) and other late 16th-century authors. There exist many very different hypotheses. The Trésor de la langue française informatisé cites sources that reject most of these hypotheses, including the only one in the dictionary of the Spanish Real Academia, which presents this as if it were not just one of many conjectures: "From Ancient Greek κατά Ματθαῖον (katá Matthaîon, “according to Matthew”), in reference to the way he describes the genealogy a