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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From screw + ball. Compare typologically German Spinner (akin to spin). Also compare weirdo and weird, from Old English wyrd (“fate”), ultimately derived from Proto-Indo-European *wert- (“to turn, to spin”).
crackpot, crank, nut, nut case, fruitcake
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Classic usage
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