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English

From Scots dour, from Latin dūrus (hard, stern), possibly via Middle Irish dúr. Compare French dur, German Dauer, Italian duro, Portuguese duro, Romanian dur, Spanish duro. Doublet of dure.

Breton

From Proto-Brythonic *duβr, from Proto-Celtic *dubros, from Proto-Indo-European *dʰubrós (deep).

Scots

From Middle Irish dúr, from Latin dūrus (hard).