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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
Borrowed from Scots dour, possibly from Latin dūrus (“hard, stern”), via Middle Irish dúr. Compare French dur, Catalan dur, Italian duro, Portuguese duro, Romanian dur, Spanish duro. Doublet of dure.
dogged, persistent, pertinacious, tenacious, unyielding
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Classic usage
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