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gibberish

/ˈd͡ʒɪ.bə.ɹɪʃ/ noun

First recorded: mid 16th century Wiktionary

Origin

First attested mid-16th century. Origin obscure. Possibly from *gibber, of onomatopoeic origin imitating to the sound of chatter, possibly from or influenced by jabber, + -ish denoting the name of a language (compare English, Finnish, Spanish, etc.). The verb gibber, first attested circa 1600, is usually regarded as a back-formation from gibberish.

From Wiktionary, via Kaikki.org (CC BY-SA)