Proto-Slavic *ǫzъkъ

→ Belarusian вузкі (inherited)

→ Bulgarian узък (inherited)

→ Czech úzký (inherited)

→ Old Church Slavonic ѫзъкъ (inherited)

→ Lower Sorbian wuski (inherited)

→ Polish wąski (mention)

→ Polish wązki (inherited)

→ Russian узкий (inherited)

→ Rusyn узкый (derived)

→ Serbo-Croatian uzak (inherited)

→ Serbo-Croatian узак (inherited)

→ Slovak úzky (inherited)

→ Slovene ozek (inherited)

→ Silesian wōnski (inherited)

→ Ukrainian вузький (inherited)