Proto-Slavic *věčьnъ

→ Belarusian вечны (inherited)

→ Czech věčný (inherited)

→ Old Church Slavonic вѣчьнъ (inherited)

→ Macedonian вечен (inherited)

→ Polish wieczny (inherited)

→ Russian вечный (inherited)

→ Serbo-Croatian vječan (inherited)

→ Serbo-Croatian вјечан (inherited)

→ Serbo-Croatian večan (inherited)

→ Serbo-Croatian вечан (inherited)

→ Slovene večen (inherited)

→ Ukrainian вічний (inherited)