野蛮【やばん】
savage, barbarous, barbaric, uncivilized, uncivilised
蛮行【ばんこう】
act of barbarity, barbarism, brutality, savagery
南蛮【なんばん】
southern barbarians (name used in ancient China for non-Chinese ethnic groups to the south), South-East Asian countries (in the late-Muromachi and Edo periods), Western Europe (esp. Spain and Portugal and their South-East Asian colonies; late-Muromachi and Edo periods), foreign (of goods from South-East Asia and Western Europe), exotic (esp. in a Western European or South-East Asian style), chili pepper, nanban, dish prepared using chili peppers and Welsh onions, thrusting the right foot and right arm forward at the same time (or left foot and left arm; in kabuki, dance, puppetry, etc.)
蛮勇【ばんゆう】
foolhardiness, recklessness, savage valour, savage valor, brute courage