One of the mysteries of the English language finally explained.
Characteristic of or resembling Rip Van Winkle; not aware of or alert to present (especially social and political) conditions.
Early 19th century; earliest use found in Mechanic's Press (Utica, New York). From the name of Rip Van Winkle + -ish.
Rip Van Winkleish/ˌrɪp van ˈwɪŋklɪʃ/
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