Where does “সাধুভাষা” come from?

সাধুভাষা (Bengali) comes from Bengali সাধু, from Sanskrit साधु, from Proto-Indo-Aryan *sáHdʰuṣ, from Proto-Indo-Iranian sáHdʰuš, from Proto-Indo-European séHdʰ-u-s, from Proto-Indo-European -us — Forms adjectives from Caland system roots.

Ancestry of “সাধুভাষা”, step by step

সাধুভাষা traces back through two separate lines of ancestry.

via Bengali সাধু

StepLanguageWordMeaning
1Bengaliসাধুsaint, ascetic, anchorite
2Sanskritसाधुstraight, right; leading straight to a goal,...
3Proto-Indo-Aryan*sáHdʰuṣ
4Proto-Indo-IraniansáHdʰušsuccessful, accomplished
5Proto-Indo-EuropeanséHdʰ-u-s
6Proto-Indo-European-usForms adjectives from Caland system roots

via Bengali ভাষা

StepLanguageWordMeaning
1Bengaliভাষাlanguage
2Sanskritभाषाspeech, language; any Prakrit dialect or a...
3Sanskritभाष
Every word from Proto-Indo-European -usEvery word from Proto-Indo-European séHdʰ-u-sEvery word from Proto-Indo-Iranian sáHdʰuš