Proto-Slavic *morkъ

→ English murk (cognate)

→ Belarusian морак (inherited)

→ Bulgarian мрак (inherited)

→ Czech mrak (inherited)

→ Kashubian mroch (inherited)

→ Old Church Slavonic мракъ (inherited)

→ Lower Sorbian mrok (inherited)

→ Macedonian мрак (inherited)

→ Polish mrok (inherited)

→ Russian морок (inherited)

→ Russian нахмурить (inherited)

→ Serbo-Croatian мрак (inherited)

→ Serbo-Croatian mrak (inherited)

→ Albanian marrtë (cognate)

→ Ukrainian морок (inherited)