Foolish, childish, or senseless behavior; nonsensical talk or actions typical of a baby or simpleton.
From baby or babe plus -ery (a place, condition, or collection of). The suffix -ery often turns nouns into terms describing characteristic behavior or qualities.
In older English, 'babery' was used to mock adults who acted foolishly—it's the predecessor to modern words like 'baby talk,' showing how language has always had creative ways to call out ridiculous behavior.
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