軽快

1. Origins, structure, and basic meaning

• Structure: 軽快 (けいかい) combines lightness 軽 and pleasant briskness 快 to describe lively movement or rhythm.
• Basic usage: It suits a springy step or a brisk drumbeat that starts a dance.

2. Common pitfalls and similar expressions

• Lively motion rather than low weight
  • 軽快 usually evaluates how movement, sound, or progress feels, not simply how little an object weighs.