Where does “достоїнство,достоинство” come from?

достоїнство,достоинство (Rusyn) comes from Old East Slavic достоиньство, from Old East Slavic достоинъ, from Proto-Slavic *dostojьnъ — worthy.

Ancestry of “достоїнство,достоинство”, step by step

StepLanguageWordMeaning
1Old East Slavicдостоиньствоdignity
2Old East Slavicдостоинъworthy
3Proto-Slavic*dostojьnъworthy
Every word from Proto-Slavic *dostojьnъ →Every word from Old East Slavic достоинъ →Every word from Old East Slavic достоиньство →