Where does “Groznyj” come from?

Groznyj (Slovak) comes from Russian гро́зный, from Proto-Slavic grozьnъ, from Proto-Slavic groza, from Proto-Balto-Slavic groź-.

Ancestry of “Groznyj”, step by step

StepLanguageWordMeaning
1Russianгро́зныйmenacing, formidable, severe, cruel
2Proto-Slavicgrozьnъterrible, disgusting; enormous
3Proto-Slavicgrozahorror
4Proto-Balto-Slavicgroź-—
Every word from Proto-Balto-Slavic groź- →Every word from Proto-Slavic groza →Every word from Proto-Slavic grozьnъ →