Latin word probus comes from Proto-Indo-European *bʰowHéyeti

Detailed word origin of probus

Dictionary entry	Language	Definition
*bʰowHéyeti	Proto-Indo-European (ine-pro)
*pr̥-	Proto-Indo-European (ine-pro)
*probʰwo-	Proto-Indo-European (ine-pro)
probus	Latin (lat)	(morally) upright, honest, virtuous. Good, serviceable, excellent, superior, able.