Where does “strojnisia” come from?

strojnisia (Polish) comes from Polish Strojny, from Proto-Slavic *strojьnъ — well-built?, slender?, slim?.

Ancestry of “strojnisia”, step by step

StepLanguageWordMeaning
1PolishStrojnydressy, decorated
2Proto-Slavic*strojьnъwell-built?, slender?, slim?
Every word from Proto-Slavic *strojьnъ →Every word from Polish Strojny →