Russian косный

← Bulgarian къ́сно (cognate)

← Old Church Slavonic късьнъ (mention)

← Lithuanian kùšlas (cognate)

← Lithuanian kušlùs (mention)

← Latvian kusls (cognate)

← Latvian kust (cognate)

← Latvian kùstu (mention)

← Latvian kusu (mention)

← Old Prussian ucka-kuslaisin (cognate)

← Serbo-Croatian ка̏сно (cognate)

← Slovene kəsȃn (cognate)

← Slovene kəsnà (mention)

← Slovene kəsə̀n (mention)

← Proto-Slavic *kъsьnъ (inherited)

→ Bulgarian късно (cognate)

→ Serbo-Croatian kasno (cognate)