Proto-West Germanic *þiustrī

→ Old English þiestre (inherited)

→ German düster (inherited(de/gmw-cfr))

→ German düster (derived)

→ West Frisian tsjuster (inherited)

→ Central Franconian deister (inherited)

→ Luxembourgish däischter (inherited)

→ Dutch duister (inherited)

→ Old Saxon thiustri (inherited)

→ Old Armenian թուխ (cognate)