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Classic usage
Reading level: hard
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
A learned borrowing from Latin assiduus, from assidere (“to sit down to”), from ad- (“to”) + sedere (“to sit”). Compare sedulous. Cognate (via assidere) to assess.
sedulous
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Classic usage
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