Proto-Slavic *umъ

→ Bulgarian ум (inherited)

→ Old Church Slavonic оумъ (inherited)

→ Old Church Slavonic оумьнъ (derived)

→ Macedonian ум (inherited)

→ Macedonian разоумъ (inherited(mk/cu))

→ Russian ум (inherited)

→ Serbo-Croatian um (inherited)

→ Serbo-Croatian ум (inherited)

→ Slovak um (inherited)