Proto-Slavic *rědъkъ

→ Belarusian рэдкі (inherited)

→ Bulgarian рядък (inherited)

→ Czech řídký (inherited)

→ Lower Sorbian rědki (inherited)

→ Polish rzadki (inherited)

→ Russian редкий (inherited)

→ Serbo-Croatian rijedak (inherited)

→ Serbo-Croatian redak (inherited)

→ Serbo-Croatian риједак (inherited)

→ Serbo-Croatian редак (inherited)

→ Slovak riedky (inherited)

→ Slovene redek (inherited)

→ Ukrainian рідкий (inherited)