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Classic usage
Reading level: hard
Estimated CEFR level: B2 — Upper-Intermediate
Estimated from word frequency; not an official CEFR classification.
From Middle English redel, redels, from Old English rǣdels, rǣdelse (“counsel, opinion, imagination, riddle”), from Proto-West Germanic *rādislī (“counsel, conjecture”). Analyzable as rede (“advice”) + -le. Akin to Old English rǣdan (“to read, advise, interpret”). Cognate with Dutch raadsel, German Rätsel.
conundrum, enigma, brain-teaser
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Classic usage
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