Proto-Slavic *tьnъkъ

→ Belarusian тонкі (inherited)

→ Bulgarian тънък (inherited)

→ Czech tenký (inherited)

→ Old Church Slavonic тьнъкъ (inherited)

→ Lower Sorbian śańki (inherited)

→ Macedonian тенок (inherited)

→ Polish cienki (inherited)

→ Russian тонкий (inherited)

→ Rusyn тонкый (inherited)

→ Serbo-Croatian tanak (inherited)

→ Serbo-Croatian танак (inherited)

→ Slovak tenký (inherited)

→ Slovene tanek (inherited)

→ Silesian ciynki (inherited)

→ Ukrainian тонкий (inherited)