Latin word proba comes from Proto-Indo-European *pr̥-, Proto-Indo-European *bhu-

Detailed word origin of proba

Dictionary entry	Language	Definition
*pr̥-	Proto-Indo-European (ine-pro)
*bhu-	Proto-Indo-European (ine-pro)
*pro-bhwo-	Proto-Indo-European (ine-pro)
probus	Latin (lat)	(morally) upright, honest, virtuous. Good, serviceable, excellent, superior, able.
probare	Latin (lat)
proba	Latin (lat)	(Late Latin) test, trial. Proof, evidence.

Words with the same origin as proba