鋭さ

1. Origins, structure, and basic meaning

• Structure: 鋭さ(するどさ) is the noun form of the quality expressed by 鋭い(するどい), meaning sharpness or keenness.
• Basic usage: It is used for a knife's edge and for keenness shown in questions or analysis.

2. Common pitfalls and similar expressions

• A physical edge and keen thinking
  • 包丁の鋭さ refers to the sharpness of a kitchen knife.
  • 分析の鋭さ figuratively refers to thinking that identifies key points keenly.
• Checking before the next action
  • 確かめてから indicates checking first and then performing the next action.