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Hi! “Ineffable” comes from Latin through French. Its Latin root, “fāri”, just meant “to speak”, and it’s the same root you find in a word like “infant” (who, in an etymological sense, is someone not (yet) being able to speak). In its etymological sense, something ineffable is something that cannot be said. It is not related to “to eff”, which is an euphemism that only dates back less than a century. Interestingly, the word “effable” actually exists, but it’s obsolete.