Where does “вежливост” come from?

вежливост (Bulgarian) comes from Russian вежливость, from Russian -ость, from Proto-Slavic -ostь — Used with adjectival stems to form abstract...

Ancestry of “вежливост”, step by step

StepLanguageWordMeaning
1Russianвежливостьpoliteness
2Russian-ость-ness, -ity
3Proto-Slavic-ostьUsed with adjectival stems to form abstract...
Every word from Proto-Slavic -ostьEvery word from Russian -остьEvery word from Russian вежливость