noun
Describes a wild, fearless, and often reckless bravery that disregards consequences. Has a somewhat literary or dramatic feel.
彼の蛮骨には誰もついていけなかった。
No one could keep up with his reckless courage.
蛮骨だけで戦いに挑んでも勝てない。
You can't win a battle with brute courage alone.