Where does “potrudno” come from?

potrudno (Polish) comes from Polish trudno, from Old Polish trudno, from Old Polish -o, from Proto-Slavic *-ǫ.

Ancestry of “potrudno”, step by step

StepLanguageWordMeaning
1Polishtrudnowith difficulty
2Old Polishtrudnowith difficulty
3Old Polish-oforms adverbs from adjectives
4Proto-Slavic*-ǫ—

Words derived from “potrudno”

Every word from Proto-Slavic *-ǫ →Every word from Old Polish -o →Every word from Old Polish trudno →