←
Ancient Greek δηρός (cognate)
←
Proto-Indo-European (inherited)
←
Proto-Indo-European *dweh₂- (mention)
←
Proto-Italic *dūros (inherited)
←
Latin dūrus (inherited)
←
Old Spanish duro (inherited)
→
Aragonese duro (cognate)
→
Papiamentu duru (derived)