Where does “простодушие” come from?

простодушие (Russian) comes from Russian просто́й, from Russian проста́ивать, from Russian простоять, from Russian стоя́ть, from Old East Slavic стоꙗти, from Proto-Slavic stojati, from Proto-Slavic stojěti, from Proto-Slavic -ěti — Creates stative verbs from perfective roots;...

простодушие (Russian): simpleness, naïveté, innocence, simple-heartedness, open-heartedness

Definitions

  1. simpleness, naïveté, innocence, simple-heartedness, open-heartedness

Ancestry of “простодушие”, step by step

простодушие traces back through two separate lines of ancestry.

via Russian просто́й

StepLanguageWordMeaning
1Russianпросто́йsimple; ordinary
2Russianпроста́иватьto stand, to stay for some time
3Russianпростоятьto stand, to stay; to stand idle; to stand, to...
4Russianстоя́тьto stand
5Old East Slavicстоꙗтиto stand
6Proto-Slavicstojatito stand
7Proto-Slavicstojěti
8Proto-Slavic-ětiInherited, stative; Deadjectival, inchoative;...
9Proto-Balto-Slavic-ēˀtei
10Proto-Indo-European-éh₁tiCreates stative verbs from perfective roots;...

via Russian душа́

StepLanguageWordMeaning
1Russianдуша́breath, spirit
2Old East Slavicдоушаsoul
3Proto-Slavicdušasoul; spirit
4Proto-Slavic*duxja
Every word from Proto-Indo-European -éh₁tiEvery word from Proto-Slavic -ětiEvery word from Proto-Slavic stojěti