Where does “грубијан” come from?
грубијан (Serbo-Croatian) comes from Serbo-Croatian гру̑б, from Proto-Slavic grǫbъ, from Proto-Slavic grěti, from Proto-Indo-European gʷʰer-, from Proto-Indo-European gʷʰe-gʷʰór-e ~ gʷʰe-gʷʰr-ḗr.
грубијан (Serbo-Croatian): boor, ruffian
Ancestry of “грубијан”, step by step