Where does “radna” come from?

radna (Polish) comes from Polish Radny, from Old Polish radny, from Old Polish -ny, from Proto-Slavic -ьnъ — -ish, -ic, -al, -ed; From adjectives.

Ancestry of “radna”, step by step

StepLanguageWordMeaning
1PolishRadnycouncilman
2Old Polishradnyprudent; wise
3Old Polish-nyforms adjectives
4Proto-Slavic-ьnъ-ish, -ic, -al, -ed; From adjectives
Every word from Proto-Slavic -ьnъ →Every word from Old Polish -ny →Every word from Old Polish radny →