蛮勇

1. Origins, structure, and basic meaning

• Structure: 蛮勇(ばんゆう) means reckless courage that gives insufficient consideration to danger.
• Basic usage: It criticizes unprepared actions or actions that put other people in danger as well.

2. Common pitfalls and similar expressions

• Compared with 勇気
  • 勇気(ゆうき) refers to courage in facing fear; 蛮勇 carries a negative judgment of recklessness.
• まで meaning even
  • 仲間まで means even one's companions.
  • It indicates that the danger extended to the companions rather than affecting only the person acting.