Where does “грѣшьнꙑи” come from?

грѣшьнꙑи (Old East Slavic) comes from Proto-Slavic grěšьnъ, from Proto-Slavic grěxъ — sin.

Ancestry of “грѣшьнꙑи”, step by step

StepLanguageWordMeaning
1Proto-Slavicgrěšьnъwrong, erroneous
2Proto-Slavicgrěxъsin
Every word from Proto-Slavic grěxъ →Every word from Proto-Slavic grěšьnъ →