Where does “безмятежность” come from?

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

безмятежность (Russian): insouciance, placidity, serenity

Definitions

  1. insouciance, placidity, serenity

Ancestry of “безмятежность”, step by step

StepLanguageWordMeaning
1Russian-ость-ness, -ity
2Proto-Slavic-ostьUsed with adjectival stems to form abstract...
Every word from Proto-Slavic -ostь →Every word from Russian -ость →