容赦

1. Origins, structure, and basic meaning

• Structure: 容赦(ようしゃ) means forgiving a fault or showing leniency in view of someone's circumstances.
• Basic usage: Both examples use 容赦なく to describe merciless or relentless behavior or action.

2. Common pitfalls and similar expressions

• From human attitude to a natural force
  • The coach's 容赦なく describes refusing to go easy on a player, while the wind's 容赦なく figuratively describes its harsh force.