完敗

1. Origins, structure, and basic meaning

• Structure: 完敗（かんぱい） combines 完, completeness, with 敗, defeat.
• Basic usage: It evaluates a loss in which one side was clearly outmatched and can function as a verb, as in 完敗した.

2. Common pitfalls and similar expressions

• Degree of defeat
  • 敗北 names defeat itself, while 完敗 emphasizes how thoroughly the opponent outmatched someone.
• Contrasting a narrow loss
  • 惜敗 suits a close, disappointing loss. Being unable to keep up with the opponent's speed in the first example explains the assessment 完敗.